2001 Microchip Technology Inc. DS41178A
PICDEM™ MSC1
USER’S GUIDE
M
DS41178A 2001 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through sug gestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microc hip Technology Incorporated with respect
to the accuracy or use of such inf orm ation, or inf ringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, MPLAB, PIC, PICmicro, PICMASTER, PICSTART,
PRO MATE, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexRO M, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microID,
microPort, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, MXDEV, PICC, PICDEM, PICDE M.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2001, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code ho pp in g
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
Note the following details of the code protection feature on PICmicro® MCUs.
•The PICmicro family meets the specifications contained in the Microchip Data Sheet.
•Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
•There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowl-
edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
•Microchip is willing to work with the customer who is concerned about the integrity of their code.
•Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
•Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
If you have any further questions about this matter , please contact the local sales off ice nearest to you.
2001 Microchip Technology Inc. DS41178A-page iii
PICDEM™ MSC1 USER’S GUIDE
12
Table of Contents
Preface
Chapter 1. Overview and Installation
1.1 Introduction .....................................................................................5
1.2 Highlights ........................................................................................5
1.3 Unpacking You r PICDEM™ MSC1 .................................................5
1.4 Installing the Hardware ...................................................................6
1.5 Installing the GUI Software .............................................................7
1.6 What the PICDEM™ MSC1 Is ........................................................7
Chapter 2. Basic Functions
2.1 Starting Communications with the Evaluation Tool ........................ 9
Chapter 3. Tutorial/Demo
3.1 Digital-to-Analog (DAC) Module Configuration .............................23
Appendix A. PICDEM™ MSC1 Schema tic s
A.1 Introduction ...................................................................................35
A.2 Highlights ......................................................................................35
A.3 Schematics ...................................................................................36
Index.......... .. ....... ....... ... ....... .. ........ ....... .. ....... ........ .. ....... ... ....... ....... .. ....... 39
Worldwide Sales and Service.......... ........ .. ....... ... ....... ....... .. ........ ....... .. .. 40
PICDEM™ MSC1 USER’S GUIDE
DS41178A-iv 2001 Microchip Technology Inc.
NOTES:
2001 Microchip Technology Inc. DS41178A-page 1
PICDEM™ MSC1 USER’S GUIDE
12
Preface
Introduction
This chapter contains general information about this manual and contacting
customer support.
Highlights
Topics covered in this chapter:
•About this Guide
•W arranty Registration
•Recommended Reading
•The Microchip Internet Web Site
•Development Systems Customer Notification Service
•Customer Support
About This Guide
Document Layout
This document describes how to install a PICDEM™ MSC1 (Mixed Signal
Controller1) on a PC and load the GUI software as a development tool for
creating the initialization assembly code for your PIC16C781/782 application.
The PICDEM™ MSC1 is the tradename for the PIC16C781/782
Microcontroller Evaluation Tool described in this manual. The manual layout is
as follows:
•Chapter 1: Overview and I nsta llation – What the PICDEM™ MSC1
is and how to install it.
•Chapter 2: Basic Functions – Describes how to get started using the
PICDEM™ MSC1 and how to access the basic functions using the GUI
software.
•Chapter 3: Tutorial/Demo - Provides an example of how you can con-
figure a typical peripheral using the PICDEM™ MSC1 and create the
initialization assembly code corresponding to your configuration.
•Appendix A: Sche matics – Provides the schematics and board layout
for the PICDEM™ MSC1.
•PICDEM™ MSC1 Worldwide Sales and Service – Lists Microchip
sales and service locations and telephone numbers worldwide.
PICDEM™ MSC1 User’s Guide
DS41178A-page 2 2001 Microchip Technology Inc.
Updates
All docume ntation becom es dated, and thi s use r’s guide is no exception.
Since the PICDEM™ MSC1 and other Microchip tools are constantly evolving
to meet customer needs, please refer to our web site at http://
www.microchip.com to obtain the latest documentation available.
Warranty Registration
Please complete the enclosed Warranty Registration Card and mail it
promptly. Sending in your Warranty Registration Card entitles you to receive
new product updates. Interim software releases are available at the Microchip
web site.
Recom mended Reading
This user’s guide describ es how to use the PICDE M™ MSC1. The data
sheets contain current information on programming the specific
microcontroller devices.
README.TXT
For the latest information on using PICDEM™ MSC1, read the README.txt
file (ASCII text file) included with the PICDEM™ MSC1 software. The
README.txt file contains update information that may not be included in this
document.
MPLAB® IDE User’s Guide (DS51025)
Comprehensive guide that describes installation and features of Microchip’s
MPLAB Integrated Development Environment (IDE), as well as the editor and
simulator functions in the MPLAB environment.
MPASM™ User’s Guide with MPLINK™ & MPLIB™ (DS33014)
Describes how to use Microchip Universal PICmicro® Mic r ocontroll er
Assembler (MPASM), Linker (MPLINK), and Librarian (MPLIB).
Technical Library CD-ROM (DS00161)
This CD-ROM contains comprehensive data sheets for Microchip PICmicro®
MCU devices available at the time of print. To obtain this CD-ROM, contact
the nearest Microchip Sales and Service location (see back page) or
download individual data sheet files from the Microchip web site (http://
www.microchip.com).
PICmicro Mid-Range MCU Family Reference Manual (DS33023)
This manual explains the general details and operation of the MCU family
architecture and peripheral modules. It is designed to complement the device
data sheets.
2001 Microchip Technology Inc. DS41178A-page 3
Preface
Microsoft® Wi ndows® Manuals
This manual assumes that users are familiar with Microsoft Windows
operating system. Many excellent references exist for this software program,
and should be consulted for general operation of Windows.
PIC16C7 81/ 782 Data Sheet (DS411 71)
This book contains details about the PIC16C781/782 Microcontroller and
more.
The Microchip Internet Web Site
Microchip provides online support on the Microchip World Wide Web (WWW)
site.
The web site is used by Microchip as a means to make files and information
easily available to customers. To view the site, the user must have access to
the Internet and a web browser, such as Netscape® Communicator or
Microsoft® Internet Explorer®. Files are also available for FTP download from
our FTP site.
Connecting to the Microchip Internet Website
The Microchip web site is available by using your favorite Internet browser.
Visit:
http://www.microchip.com
The file transfer site is available by using an FTP program/client to connect to:
ftp://ftp.microchip.com
Development Systems Customer Notification Service
Microchip started the customer notification service to help our customers
keep current on Microchip products with the least amount of effort. Once you
subscribe to one of our list servers, you will receive e-mail notification
whenever we change, update, revise or have errata related to that product
family or development tool. See the Microchip web page at
http://www.microchip.com for other Microchip list servers.
The Development Systems list names are:
•Compilers
•Emulators
•Programmers
•MPLAB
•Otools (other tools)
PICDEM™ MSC1 User’s Guide
DS41178A-page 4 2001 Microchip Technology Inc.
Once you have determined the names of the lists that you are interested in,
you can subscribe by sending a message to:
listserv@mail.microchip.com
with the following as the body:
subscribe <listname> yourname
Here is an example:
subscribe programmers John Doe
To UNSUBSCRIBE from these lists, send a message to:
listserv@mail.microchip.com
with the following as the body:
unsubscribe <listname> yourname
Here is an example:
unsubscribe programmers John Doe
The following sections provide descriptions of the available Development
Syste ms lists.
Customer Support
Users of Microchip products can receive assistance through several
channels:
•Distributor
•Local Sales Office
•Field Application Engineer (FAE)
•Corporate Applications Engineer (CAE)
•Systems Information Upgrade Hotline
Technical Support can be obtained through your local F AE or CAE. CAEs may
be contacted at (480) 792-7627. Contact the Sales office for prices and
literature requests. Sales offices are listed on the back cover of this User
Guide.
In addition, there is a Systems Information and Upgrade Line. This line
provides system users a listing of the latest versions of all of Microchip's
development systems software products. Plus, this line provides information
on how customers can receive any currently available upgrade kits.
The Hotline Numbers are:
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
2001 Microchip Technology Inc. DS41178A-page 5
PICDEM™ MSC1 USER’S GUIDE
12
Chapter 1. Overview and Installation
1.1 Introd uction
The PICDEM™ MSC1 with its PC-based Graphical User Interface (GUI) soft-
ware serves as a stand-alone development and evaluation tool for the
PIC16C781/782 Microcontrollers, or as a user interface to the peripherals.
1.2 Highlights
The topics covered in this chapter are:
•Unpacking your PICDEM™ MSC1 hardware and software
•Installing the hardware
•Installing the GUI software
•What the P ICDEM™ MSC1 is
•How the PICDEM™ MSC1 helps the Developer
1.3 Unpacking Your PICDEM™ MSC1
1.3.1 Supplied Items
The items contained in your PICmicro box are:
•PICDEM™ MSC1 Circuit Board with a programmed PIC16C782
installed
•PIC16C781/782 Data Sheet (DS41171)
•CD-ROM containing: GUI software, User’s Guide, Board Schematics,
Monitor Firmware, Example Arbitrary Waveform
•Assorted jumpers
1.3.2 Required Items
The items required are:
•PC running Windows 95 or newer operating system
•9 VDC Power Supply
•9-pin RS-232 Cable
PICDEM™ MSC1 User’s Guide
DS41178A-page 6 2001 Microchip Technology Inc.
1.4 Installing the Hardware
Perform the following procedure to install the PICDEM™ MSC1 hardware:
1. Connect the PICDEM™ MSC1 circuit board to the 9 VDC Power Supply
as shown in the Fi gure 1.1 and plug in the AC connect or for the 9 VDC
Power Supply.
Figure 1.1: Installing the Hardware
2. Connect one end of the RS-232 cable to the Serial Port of your PC.
3. Connect the other end of the RS-232 cable to the PICDEM™ MSC1 cir-
cuit board as shown in Figure 1.1. This completes the hardware installa-
tion.
To PC Serial Port
RS-232 connector
PICDEM™ MSC1 Circuit Board
9 V
DC
Power Supply
9 V
DC
Power Connector
AC Power
RS-232 cable
AV
DD
LED
V
DD
LED
Note: The AVDD LED and the VDD LED should be lit, indicating the Ana-
log and Digital Power Supplies are operating.
2001 Microchip Technology Inc. DS41178A-page 7
Overview and Installation
1.5 Installing the GUI Software
The GUI software adheres to standard Windows® conventions and should be
easy to install for anyone familiar with other Windows applications.
Perform the following procedure to install the GUI software:
1. Insert the CD containing the GUI software into your PC. Locate and dou-
ble-click on the setup.exe file in the CD Root Directory. An Installation
Wizard will guide you through the installation process.
2. Follow the instructions in the Installation Wizard. The installation creates
an entry in the Sta rt → Programs gro up. The Wizard will al so create a
PICDEM™ MSC1 icon for your desktop.
3. You can start the GUI software by using the Start → Programs →
PICDEM™ MCS1 sequence.
1.6 What the PICDEM™ MSC1 Is
The Evaluation Tool is comprised of:
•Printed circuit board
•PC based GUI
•UV erasable PIC16C782 with monitor firmware
•9V power supply (IEC)
•RS-232C cable (9-pin)
•General purpose jumper wires
In stand-alone mode, the GUI is useful for discovering the features of all the
PIC16C781/782 peripherals and identifying which registers are affected by
the different configurations. When used in conjunction with the evaluation
board, the GUI gives instant access to the PIC16C781/782 peripherals allow-
ing on-the-fly configuration changes by means of an RS-232 link between a
PC and the evaluation board.
The GUI includes a Code Generator that can build the initialization assembly
code that corresponds to the selected configuration. Developers can use the
Code Generator to perform an entire configuration using the Evaluation Tool
and s ave it as a di sk file.
The firmware of the PICDEM™ MSC1 allows you to:
•Configure the inputs and outputs of each peripheral module using your
application parameters
•Configure the operation of each peripheral module
•Load and view the contents of the Special Purpose Registers needed to
run your application
•Operate a dynamic conversion loop for scoping the Output of the DAC
Module
•Save the configuration file that you have created and insert it into your
application software.
PICDEM™ MSC1 User’s Guide
DS41178A-page 8 2001 Microchip Technology Inc.
NOTES:
2001 Microchip Technology Inc. DS41178A-page 9
PICDEM™ MSC1 User’s Guide
12
Chapter 2. Basic Functions
2.1 Starting Communications with the Evaluation
Tool
2.1.1 Introduction
Start the GUI software by selecting Start →Programs→ PIC D EM MS C1, or
you can double-click the PICDEM MSC1 program icon on your desktop. The
GUI Control Panel displays, as shown in Figure 2.1.
2.1.2 Using the GUI Control Panel
Figure 2.1: PICDEM™ MSC1 Control Panel
Features Global to All Peripherals
PICDEM™ MSC1 User’s Guide
DS41178A-page 10 2001 Microchip Technology Inc.
Port Sel ectio n
Communications port selection is not automatic, so you need to make the
communications port selection with the Options→Communications Setup
pull-down menu option (see Figure 2.2) before attempting to connect to the
Evaluation Board.
Figure 2.2: Communications Setup
Select the Communications Port that matches the one you are using for the
serial communications with the Evaluation Board, as shown in Figure 2.3.
Figure 2.3: Communications Port Selection Menu
2001 Microchip Technology Inc. DS41178A-page 11
Basi c Functions
Starting Communications
Select the Pull-down menu Options→Enable Eval Board to begin communi-
cations between the GUI Control Panel and the PICDEM™ MSC1, as shown
in Figure 2.4.
Figure 2.4: Enable Evaluation Board
Select the Input/Output tab and note the Port A and Port B functions to verify
that the GUI is communicating with the Evaluation Board.
Serial Communications with the PICDEM™ MSC1 Evaluation Board
Since the PIC16C781/782 does not have a UART peripheral, serial communi-
cations are "bit-banged" with software timing loops. Timing calibration is per-
formed automatically each time the board is enabled. The Evaluation Board
clock is the internal RC oscillator.
One characteristic of this oscillator is that it may drift slightly in frequency with
changes in temperature. If you expect to use the Evaluation Board over a
wide temperature variation, you will need to recalibrate the communication
timing at each new operating temperature.
You can recalibrate at any time by de-selecting the PICDEM MSC1 board by
selecti ng Options →Enable Eval Board, then selecting Options→Enable Eval
Board a second time to recalibrate and re-establish communications. When
the connection is made, all registers will be initialized to the values set in the
GUI. This procedure of disconnecting, then reconnecting, is also useful if you
accidentally RESET the PIC16C781/782 with a stray probe or ground strap.
PERIPHERAL ORGANIZATION
The PIC16C781/782 peripherals are organized as tabbed pages (see Figure
2.1), one for each major peripheral function. These include:
•Input/Output
•Analog-to-Digital Converter (ADC)
•Digital-to-Analog Converter (DAC)
•Comparators and Operational Amplifier
•Programmable Switch Mode Controller (PSMC)
Note: The MCLR function in Port A and the Dgtl Out: RB4 and DGtl In:
RB5 functi ons are sho wn in gray when the GUI sof tware is initia lly
communicating with the Evaluation Board.
PICDEM™ MSC1 User’s Guide
DS41178A-page 12 2001 Microchip Technology Inc.
•Timers
•Memory Access
When a configuration change is made, the register(s) affected by the change
will turn red, calling attention to where the changes occurred. Register values
cannot be entered directly. However, when the Evaluation Board is active,
register values may be retrieved from the Evaluation Board by double-clicking
on the register name. The register font color changes to blue in response.
Changing the Default Font
In some cases, the default font will not fit in the Register Display boxes. You
can change the font selection and size with the Options->Data Font menu
option, as shown in Figu re 2.5.
Figure 2.5: Data Font Selection
The best results will be obtained by choosing a scalable fixed-spacing font
such as Courier N ew.
Some controls of the GUI are interlocked so that a change to one selection
automatically selects other controls necessary for the proper operation of the
selected item. For example, selecting PORTA RA0 as the non-inverting Op
Amp input automatically selects RA1 as the inverting input and RB3 as the
Op Amp output.
Special Conventions
A special convention pertains to the following edit boxes:
•PORTA
•PORTB
•Timer0
•Timer1
•Memory Address
•Memory Data
When typing in one of these boxes, the font color changes to red, indicating
that the entry is local only to that box. When the <Enter> key is pressed, the
entry in the box is sent to the corresponding register and the font color reverts
to black. If focus (i.e., clicking outside the box) is moved outside of the edit
box before the <Enter> key is pressed, the box is restored to its original con-
2001 Microchip Technology Inc. DS41178A-page 13
Basi c Functions
tents and no action is taken. When the GUI is actively connected to the Eval-
uation Board, entries are instantly and automatically sent to the PIC16C782.
GLOBAL ITEMS
Items that are global to all the peripherals are located in the GUI outside of the
tabbed pages (see Figure 2.1). Global items include:
•Special Function Registers
•Internal Voltage Reference Control (VR)
•Display Mode Selection (Binary or HEX)
•Pull-Down Menus
•Edit Boxes for the AVDD and VREF1 voltages
File Menu Functions
Click on the File menu to view the options, as shown in Figure 2.6.
Figure 2.6: File Menu Options
Except for the Generate Code option, the options on the File Menu are stan-
dard Microsoft Windows functions:
•Open... - allows you to open a previously saved version of the PICDEM
MSC1 GUI configuration with all the parameters and data to use as a
starting point for a new configuration.
•Save - allows you to capture and save the GUI information and configu-
ration data as a file.
•Save As... - same as Save, but allows you to change the name of the
file saved.
•Generate Code... - Creates an Initialization assembly code file that cor-
responds to the selected configuration.
•Exit - Closes an d terminates the program.
Note: The AVDD and VREF1 entries are used to compute some of the dis-
play values for the ADC and DAC peripherals, and have no other
effects. If these inputs are known to be different than the values
shown, enter the correct values.
PICDEM™ MSC1 User’s Guide
DS41178A-page 14 2001 Microchip Technology Inc.
2.1.2.1 Input/Output
Use the Input/Output tab to configure the Port A and B functions, as shown in
Figure 2.7. Some of the Port pins can be mixed signal (i.e., they can be either
digital or analog). I/O functions are fully described in Section 3.0 of the
PIC16C781/782 Data Sheet (DS41171).
Figure 2.7: Input/Output Functions
Use drop-down menu
to configure Port bit
functions.
Register values are Read Only. Double-click on register name
to read value from PICDEM MSC1 board.
2001 Microchip Technology Inc. DS41178A-page 15
Basi c Functions
2.1.2.2 Analog-to-Digital Converter (ADC)
Use the ADC tab to configure the 10 inputs (shown in the ADC Input Select
area) to the Analog to Digital Converter, as shown in Figure 2.8. The ADC
allows conversion of an analog input signal to a corresponding 8-bit digital
value. ADC functions are fully described in Section 9.0 of the PIC16C781/782
Data Sheet (DS41171).
Figure 2.8: Analog-to-Digital Converter Peripheral (ADC) Functions
Names change to
correspond with
selected pin
function
Read ADC Continuous Mode checkbox
(1)
single ADC read button
ADC - Internal RC clock source - Required when performing
ADC conv ersion s during SLE EP Mode
Note 1:
When the Read ADC Continuous Mode is checked, ADC readings are
automatically updated about 10 times per second.
PICDEM™ MSC1 User’s Guide
DS41178A-page 16 2001 Microchip Technology Inc.
2.1.2.3 Digital-to-Analog Converter (DAC)
Use the DAC tab to configure the Digital to Analog Converter (DAC) module,
as shown in Figure 2.9. The DAC module generates an output voltage pro-
portional to the value in the 8-bit DAC Register. DAC functions are fully
described in Section 10.0 of the PIC16C781/782 Data Sheet (DS41171).
Figure 2.9: Digital-to-Analog (DAC) Peripheral Functions
Change DAC Output by moving slider or by entering desire d value in Output text box
2001 Microchip Technology Inc. DS41178A-page 17
Basi c Functions
ARBITRARY WAVEFORM
The DAC Arbitrary Waveform function is a utility that provides for sending a
set of user-defined data bytes to the DAC one byte at a time, wi th a user-
defined dwell time between each byte. The data set must consist of 2 to 80
bytes. The dwell time is determined by waiting a user-defined number of
timer0 count intervals. The utility computes dwell time as a function of :
•Timer0 clock
•Timer0 prescale
•Number of points in the waveform
•User-defined waveform period or frequency parameter.
Timer0 counts must be between 2 and 255. Adjust the paramaters to ensure
the count is within these limits.
The period of the waveform is defined as the time required for all the wave-
form points to be output.
Two types of waveforms can be computed by the utility:
1. A sine wave (see Figure 2.10)
2. A triangle wave (see Figure 2.11)
An unlimited number of other waveforms can be generated external to the util-
ity and saved as a text file, which the utility can retrieve. Each point of the
waveform is represented as an integer between 0 and 255. The set of points
is saved as a text file with one integer per line. If the waveform file contains
more than 80 integers, the Arbitrary Waveform utility accepts only the first 80.
The DAC data is displayed in the preview window when the waveform is gen-
erated or loaded from a file. Two waveform periods are displayed, so that
unexpected discontinuities between the last and first data bytes can be identi-
fied. The preview window displays the waveform in an unsmoothed format
that represents the expected DAC output.
Figures 2.10 and 2.11 show examples of utility generated sine and triangle
waveforms respectively.
PICDEM™ MSC1 User’s Guide
DS41178A-page 18 2001 Microchip Technology Inc.
Figure 2.10 : Sine Wave Example
Figure 2.11: Triangle Waveform Example
Frequency
Divider for
Timer0/WDT
(Up to 80 max)
The more points
sampled, the smoother
the waveform
Timer Counts must be
between 2 and 255
Frequency
Divider for
Timer0/WDT
(U p to 80 max)
Output of DAC
waveform will
resemble this
stepped pattern
on a scope
2001 Microchip Technology Inc. DS41178A-page 19
Basi c Functions
2.1.2.4 Comparators/Op Amp
Use the Comparators/Op Amp tab to configure the two separate voltage com-
parators, C1 and C2, as shown in Figure 2.12. Internal voltage reference is
provided by the VDAC option for both comparators. An external voltage refer-
ence can be supplied to C1 via the AN3/VREF input and the AN2/V REF2 input
for C2. You can also use the same tab to configure the Operational Amplifier
(OPA) module.
The Comparator Module functions are fully described in Section 12.0 of the
PIC16C781/782 Data Sheet.
The Operational Amplifier (OPA) Module is fully described in Section 11.0 of
the PIC16C781/782 Data Sheet (DS41171).
Figure 2.12: Comparators/Op Amp Peripheral Functions
Calibrate function is enabled only when
Enabling the Op Amp automatically configures the GUI I/O pin functions.
PICDEM MSC1 board is active
PICDEM™ MSC1 User’s Guide
DS41178A-page 20 2001 Microchip Technology Inc.
2.1.2.5 Progr amma ble Switch Mode Control ler (P SM C)
Use the PSMC tab to configure the PSMC module, as shown in Figure 2.13.
This module provides all the necessary features to implement a pulsed feed-
back control system. The PSMC generates a pulsed output based on its ana-
log feedback. The Programmable Switch Mode Controller (PSMC) is fully
described in Section 13.0 of the PIC16C781/782 Data Sheet (DS41171).
Figure 2.13: PSMC Peripheral Functions
Enabling the PSMC automatically configures the GUI I/O pin functions
2001 Microchip Technology Inc. DS41178A-page 21
Basi c Functions
2.1.2.6 Timers
Use the Timers t ab to configure Timer0 and T imer1, as shown in Figure 2.14.
Timer0 can operate as either a timer or a counter. The Timer0 Module is
described in Section 5.0 of the PIC16C781/782 Data Sheet (DS41171). The
Timer1 module is fully described in Section 6.0 of the PIC16C781/782 Data
Sheet (DS41171).
Figure 2.14: Timers / Peripheral Functions
Internal
External
PICDEM™ MSC1 User’s Guide
DS41178A-page 22 2001 Microchip Technology Inc.
2.1.2.7 Memory
Use the Memory tab to access Data or Program Memory, as shown in Figure
2.15. The Memory tab also contains the Configuration Word functions which
may be changed only when communications between the GUI and the PIC-
DEM™ MSCI Board have been turned off.
Memory Organization is fully described in Section 2.0 of the PIC16C781/782
Data Sheet (DS41171).
Program Memory Read (PMR) is fully described in Section 4.0 of the
PIC16C781/782 Data Sheet (DS41171).
Oscillator Configuration is fully described in Section 14.2 of the PIC16C781/
782 Data Sheet (DS41171).
The Brown Out Threshold V oltages are fully described in Section 17.7.4 of the
PIC16C781/782 Data Sheet (DS41171).
The Configuration bits are fully described in Section 14.1 of the PIC16C781/
782 Data Sheet (DS41171).
Figure 2.15: Memory Functions
Configuration Setup Tool Area
Note: The Confi guration Word Se tup Tool A rea in the GUI is active only
when the communications with the Evaluation Board have been
turned off. The Configuration Word does not affect the PICDEM
MSC1 boar d configu ration. The Configura tion Word is us ed at the
beginning of Code files.
2001 Microchip Technology Inc. DS41178A-page 23
PICDEM™ MSC1 User’s Guide
12
Chapter 3. Tutorial/Demo
3.1 Digital-to-Analog (DAC) Module Configuration
3.1.1 DAC Module Setup
In this project you will configure a digital-to-analog conversion that requires
stepping through a series of digital values to produce an analog sine wave
output. You can utilize the Arbitrary Waveform feature of the PICDEM™
MSC1 to set up the conversion parameters and exercise them in a looping
environment to allow scoping the output of the DAC.
In this example, you will perform the setup tasks to:
•Configure a single digital input/output line
•Exercise a conversion loop to allow scoping of the DAC output
•Save the configuration file to be used in your application.
3.1.1.1 Enabling the DAC Module
1. Start the GUI software by selecting Start→Programs→PICDEM MSC1,
or you can double-click the PICDEM MSC1 icon on your desktop.
2. Selec t the Pu ll -d own m enu Opti ons→Ena ble Eval Bo ard to begin c om -
munications between the GUI Control Panel and the PICDEM™ MSC1.
3. Select the Input/Output tab on the GUI Control Panel, as shown in Figure
3.1.
PICDEM™ MSC1 User’s Guide
DS41178A-page 24 2001 Microchip Technology Inc.
Figure 3.1: Selecting the Input/Output Tab
4. Using the drop-down menu of RB1, select the Anlg Out:VDAC option and
press <Enter>, as shown in Figure 3.2.
Figure 3.2: Enabling the VDAC Output
5. Select the DAC tab on the Evaluation Tool Control Panel. The Control
Panel displays the DAC controls, as shown in Figure 3.3. Note the DAC
output is shown enabled.
2001 Microchip Technology Inc. DS41178A-page 25
Tutorial/Demo
Figure 3.3: DAC Setup Initial Display
The DAC module is controlled by means of four Special Function registers:
•DACON0
•DAC
•TRISB
•ANSEL.
The DACON0 register controls three items:
•Enable/disable the DAC
•Enable DAC output on RB1/AN5/VDAC pins (providing ANSEL<5>=1
and TRISB<1>=1)
•Selection of reference voltage.
The DAC register holds the digital value to be converted to analog output.
The TRISB and the ANSEL registers are the primary controls for the configu-
ration of PORTB pins.
DACON0
DAC Output
DAC output
DAC module
Arbitrary
button
enabled
enable
enable
Waveform
shows
Note: DACON0 re gister shows al l zeros before the DA C is enabled and
configured.
PICDEM™ MSC1 User’s Guide
DS41178A-page 26 2001 Microchip Technology Inc.
The Evaluation Board software has built-in safeguards against performing
certain functions out of sequence, or executing functions with missing param-
eters. For example, if you were to click the Arbitrary Waveform button (shown
above) at this point in the configuration, you see the following warning mes-
sage, shown in Figu re 3.2:
Figure 3.4: DAC Warning
This message informs you that the Arbitrary Waveform will not display on the
DAC output pin unless the DAC output has been enabled, the DAC module is
turned on, and the timer source is defined as either internal or, if external,
supplied via jumpering to the clock source input pin. You can ignore the warn-
ing and continue with your configuration by clicking OK, but the output wave-
form will not be available if you have not satisfied the conditions mentioned in
the warning message.
6. Enable the DAC module by clicking the DAC ON radio button.
The Control Panel changes to appear as shown in Figure 3.3.
2001 Microchip Technology Inc. DS41178A-page 27
Tutorial/Demo
Figure 3.5: Enabling the DAC Module and Output
7. Select the T imer tab on the Evaluation Board Control Panel. The Timer0
and Timer1 controls display as shown in Figure 3.4. For this example, we
will use the internal clock function, FOSC/4 as the clock source for
Timer0.
DACON0
DAC module
enabled and
DAC output is
enabled
(in red)
DAC module
enabled
DAC output
is enabled
shows
is
to RB1
PICDEM™ MSC1 User’s Guide
DS41178A-page 28 2001 Microchip Technology Inc.
Figure 3.6: Clock Source Selection
8. Select FOSC/4 as the source for the internal clock.
See the PIC16C781/782 Data Sheet (DS41171) for Option Register details.
3.1.1.2 Using the Arbitrary Waveform Feature
The PICDEM™ MSC1 GUI contains an Arbitrary Waveform feature that can
be used for testing the DAC peripheral. This feature allows you to generate
sinusoid or triangle wave data to upload to the DAC. Y ou can also load a wave
data file previously generated and saved as a text file. Wave data files consist
of integers between 0 and 255, one integer per line. Each line corresponds to
a waveform data point. Up to 80 points can be specified. If more than 80
points are in the file, only the first 80 will be used. Less than 80 points will
automatically RESET the point counter to the number of points specified in
the file. An example waveform file (ArbWave.txt) is included in the installa-
tion directory.
9. Select the Arbi trary Waveform button on the DAC co ntrol section of th e
Control Panel. The Arbitrary Waveform dialog box displays, as shown in
Figure 3.5.
Set clock
FOSC/4
source to Note
Option_Reg
changes
value when
clock
source
changes
Note: Bit 5 of the OPTION_REG is set to a zero, indicating the Internal
instruction cycle clock (FOSC/4) has been selected.
2001 Microchip Technology Inc. DS41178A-page 29
Tutorial/Demo
Figure 3.7: Arbitrary Waveform Dialog Box
10. Select the Sine waveform button. The follo wing waveform r epresentin g
two periods of a sine wave is displayed, as shown in Figure 3.6:
Figure 3.8: Sine Waveform Selected
11. Select the GO button. The following message appears, as shown in
Figure 3.7:
Sine waveform
button
waveform
sampling
parameters
PICDEM™ MSC1 User’s Guide
DS41178A-page 30 2001 Microchip Technology Inc.
Figure 3.9: Adjust Prescale Message
12. Set the Prescale ratio to 1:4. This will bring the Timer Count down to 250,
as shown in Figure 3.8.
Figure 3.10: Setting the Prescaler
13. Click the GO button to start the DAC output loop execution. The GO but-
ton changes to STOP.
Note: When you change the Prescale setting, the T imer Count changes to
a new value. The timer counts parameter is Read Only. Timer
Counts are automatically computed as a function of Timer0 fre-
quency, number of points, period (or frequency), and prescaler
value. You can decrease the Timer Count by increasing the pre-
scale ratio.
Set Prescale to
1:4 to change
Line Count to
250
2001 Microchip Technology Inc. DS41178A-page 31
Tutorial/Demo
At this point the firmware is performing a troubleshooting loop on the digital-
to-analog conversion. You can now scope the output of the DAC module to
see the actual waveform as it approximates a sine wave analog output. To
stop the loop, click the STOP button. If you want to make the waveform steps
smoother, increase the number of points to 80 and press <Enter>. Then
recom pute th e 80 poi nt sine wa ve by selec ting t he Sine But ton. Th e sinew ave
changes to the one shown in Figure 3.9.
Figure 3.11: Smoothing the Waveform
3.1.1.3 Generating a Code File
The PICDEM™ MSC1 includes a Code Generator that will write an initializa-
tion assembly code file corresponding to the selected configuration.
If you want a Configuration Word different from the PICDEM MSC1 configura-
tion, you will need to turn off commun ications between the Evaluation Board
and the GUI:
Note: The Presc ale v alu es are gr ay ed ou t whe n the ti ming l oop is act ive.
While th e timing loop is ac tive, you cannot cha nge param eters. To
change any parameters, you must stop the loop by clicking the
STOP button or the EXIT button.
Increasing the Number of
Points to 80 makes the
Sine Waveform smoother
PICDEM™ MSC1 User’s Guide
DS41178A-page 32 2001 Microchip Technology Inc.
1. Select the Pull-down menu Options→Enable Eval Board to uncheck this
selection and stop communications between the GUI Control Panel and
the PICDEM™ MSC1.
2. Select the Memory tab of the PICDEM™ MSC1 control panel. The Con-
figuration Word section of the panel is now active, as shown in Figure
3.10.
3. Select the desired Configuration Word parameters for your application.
Figure 3.12: Configuration Word Functions
4. Select the Generate Code option from the File menu, as shown in Figure
3.11.
Figure 3.13: Generate Code Option
A File Dialog displays, asking you to choose a folder or location for storing the
*.inc file that will be generated. The generated file will look similar to the
one shown in Figure 3.12.
2001 Microchip Technology Inc. DS41178A-page 33
Tutorial/Demo
Figure 3.14: Sample Generated Code File
__CONFIG 0x3FFF
org 0x000
goto Initialize
org 0x004
; Insert interrupt service routine here
Initialize
BANKSEL PORTA
movlw 0x20
movwf PORTA
movlw 0xF0
movwf PORTB
movlw 0x00
movwf T1CON
movlw 0x00
movwf ADCON0
BANKSEL ANSEL
movlw 0xFF
movwf ANSEL
movlw 0xFF
movwf WPUB
movlw 0xFF
movwf TRISA
movlw 0xFF
movwf TRISB
movlw 0x00
movwf REFCON
movlw 0x00
movwf ADCON1
movlw 0xFF
movwf OPTION_REG
BANKSEL DACON0
movlw 0x00
movwf DACON0
movlw 0x00
movwf CM1CON0
movlw 0x00
movwf CM2CON0
movlw 0x00
movwf CM2CON1
movlw 0x00
movwf OPACON
movlw 0x00
movwf CALCON
movlw 0x00
movwf PSMCCON0
movlw 0x00
movwf PSMCCON1
; Insert user code here
PICDEM™ MSC1 User’s Guide
DS41178A-page 34 2001 Microchip Technology Inc.
NOTES:
2001 Microchip Technology Inc. DS41178A-page 35
PICDEM™ MSC1 User’s Guide
12
Appendix A. PICDEM™ MSC1 Schematics
A.1 Introduction
This appendix contains schematics associated with the PICDEM™ MSC1.
A.2 Highlights
Topics covered in this appendix:
•Evaluation Board Schematic
•Parts Placement
•Evaluation Board Hardware
•Evaluation Board Firmware.
PICDEM™ MSC1 User’s Guide
DS41178A-page 36 2001 Microchip Technology Inc.
A.3 Schematics
Figure A.1: PICDEM™ MSC1 Schematic
AV
SS
AV
DD
AV
SS
AV
DD
AV
DD
AV
SS
AV
SS
OSC1
RA0 RB0
OSC1
AV
SS
DIGSUP
ANSUP
AV
DD
+5V
+5V
AV
SS
330
R4
R3
AV
SS
1
TPP1
TP-60R38
D5 RED
D6 RED
D4 RED
+5V
+5V
2
CW
R8
10K
POT-3352E
D7 RED
TP
P2
TP-60R38
1
3
2
J2
DJ005B
D3
1N4001
Y1
4MHz
RESONATOR-ZTT
X1
FIDUCIAL_PP
X2
FIDUCIAL_PP
330
R1
330
R2
+5V
R15 3.3K
R16 3.3K
R14 3.3K
2
14
3
S1
SW-B3F1000
+5V
4
VCC3
OUT
2GND
1NC/OE
Y2
OSC_CAN
X3
FIDUCIAL_PP
3
OUT
1IN
U4
LM2937-IMP-5.0
3
OUT
1IN
U1
LM2937-IMP-5.0
+5V
R17 3.3K
J3
SIP_4
9
PIN9 8
PIN8 7
PIN7 6
PIN6
1PIN1
2PIN2
3PIN3
4PIN4
5PIN5
DE9S-FRS
J1
470
R13
4MCLR
RA4/TOCKI
5V
SS
6
AV
SS
15
AV
DD
16 V
DD
1RA0
RA1
RA2
RA3
9
RB0/INT
10
RB1
11
RB4
12
RB5
13
RB6
14
RB7
19
RB2
20
RB3
17 OSC2/CLKOUT
18 OSC1/CLKIN
U2
PIC16C78X_DIP
40
39 38
37 36
35 34
33 32
31 3029 28
27 2625 24
23 22
21 20
19 18
17 16
15
13
11 10
98
76
54
3
2
1
12
14
HDR2X20O/E
J5
1
2PHDR
J4
470
R10
1C1+
6V-
3C1-
12R1OUT
9
R2OUT
11T1IN
10T2IN
2V+
14
T1OUT7
T2OUT13
R1IN8
R2IN
5
C2-
4
C2+
U3
TC232_MAX232A
2
CW
CCW
R9
10K
POT-3352E
470
R12
J6
47K
RA6
Red
Red
R7
R5
D2 3.3K
3.3K
D1
AVDD
AVSS
+5V
RA7
RB3
RB2
RA0
RA1
RA4
RA5
RB7
RB6
RA2
RB5
RA3
RB0
RB1
RB4
33pF
C13
R6
RC mode
33pF
C14
2PHDR
RA6
12
2
RA7
R11
0.1
µ
F
C1
RA1
2
RA2 7
RA3 8
RA4 3
RA5
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RB5
.1
µ
f
C15
RB4
1
µ
f
1
µ
f
C9
C6
1
µ
f
C7
16
V
CC
GND
15
.1
µ
f
C2
1
µ
f
C8
330
3
1
1
1
2
3
4
CCW
AV
SS
AV
DD
3
1
J7
.1
µ
F
C10
C5
DIGSUP
1
µ
F
C11
ANSUP
COM
2
AV
SS
.1
µ
F
C12
47
µ
F
C4
2COM
.1
µ
f
C3
+5V
V
BAT
4
0
P
I
N
H
E
A
D
E
R
10
µ
F
OPTIONAL
(NOT INSTALLED)
2001 Microchip Technology Inc. DS41178A-page 37
PICDEM™ MSC1 Schematics
Figure A.2: Parts Placement Diagram
PICDEM™ MSC1 HARDWARE
The supplied Evaluation Board consists of:
•A PIC16C782 with the MONITOR firmware
•Dual linear 5 volt DC supplies
•An RS-232 interface
•A generous prototyping area (see Figure A.2).
D7 pin
D6 pin
D5 pin
D4 pin LED D4
LED D5
LED D6
LED D7
AVDD LED
VDD LED
VDD Jumper
AVDD Jumper +9VDC Connector
RS-232 Connector
Master Clear (MCLR) Pushbutton
General Purpose
Bus Lines
Remove these 2 jumpers when using external oscillator
Optional Plug in crystal or resonator here
Optional Plug in external oscillator here
Prototyping Area
40-pin header
Note: There ar e four Gener al Purpose Bus Lines provided in the Proto-
typing Area for distributing signals across the area (see Figure
A.2).
PICDEM™ MSC1 User’s Guide
DS41178A-page 38 2001 Microchip Technology Inc.
A 40-pin header between the PIC16C782 and the prototype area is intended
for jumpering prototype circuitry to the PIC16C782 or expanding the prototype
area by plugging a pre-made circuit onto the evaluation board. The VDD and
AVDD jumpers connect the on-board linear regulators to the PIC16C782 cir-
cuit and prototype areas. Removal of these jumpers allows for supply volt-
ages and capacity other than that provided by the on-board five volt
regulators. The RS-232 interface is two lines, asynchronous without hand-
shaking. Connection to the PC is via a 9-pin subminiature D connector, wired
for a standard 9-conductor serial port cable.
EVALUATION BOARD FIRMWARE
The Evaluation Board firmware is a simple monitor program that provides
read access to any of the PIC16C781/782 Special Function and memory data
registers or program locations. The firmware also provides write access to
any of the Special Function and data registers. The RS-232 interface is "bit-
banged," since the PIC16C781/782 does not contain a USART peripheral.
Immediately after a RESET, the firmware enters a Search mode for baud rate
calibration. The first character must be a ten-bit serial sequence composed of:
•Start bit (zero)
•Seven consecutive data zeros
•A one data bit
•A stop bit (one).
This is equivalent to sending a H’80’ character from a serial port set up for:
•Eight data bits
•One start bit
•One stop bit
•No parity.
You can communicate with the PICDEM™ MSC1 Evaluation Board directly
from a PC with a hyperterminal window setup as just described with a baud
rate of 9600 or less, and local echo turned off. Immediately after the Evalua-
tion Board Reset, send the calibration character from the hyperterminal win-
dow by typing <Alt>(0128). In other words, hold down the <Alt> key down
while typing the four Key Pad numbers 0, 1, 2, 8 in sequence, then release
the <Alt> key. The Num Lock function must be enabled and the Key Pad num-
bers must be used instead of the number keys at the top of the keyboard.
Confirm proper calibration by typing the <Enter> key. The Evaluation Board
will respond with the ’>’ character . All characters are echoed by the Evaluation
Board firmware. Only those sequences corresponding to an actual command
will be processed. See the MONITOR.ASM file for details about the command
protocol. Baud rate recalibration can be remotely requested by sending a
break character that is at least three times the character time of the most
recent calibration.
A Break can be sent from the Hyperterminal by typing <CTRL><BREAK>
together.
Note: The AVDD and V DD jumpers mus t be in place a s shown when the
internal supply is the primary power source.
12
2001 Microchip Technology Inc. DS41178A-page 39
PICDEM™ MSC1 USER’S GUIDE
A
Analog to Digital Converter (ADC) ................. 15
Arbitrary Wav ef orm .............. .................... ...... 17
C
Changing the Default Font ............................. 12
Clock Source Selection .................................. 28
Comparators/Op Amp .................................... 19
Components ..................................................... 5
Configuration Word Functions ........................ 32
customer notification service ............................ 3
Customer Support ............................................ 4
D
DAC Module Setup ......................................... 23
Development Systems list names .................... 3
E
Enabling the DAC Module .............................. 23
Evaluation Board Firmware ............................ 38
F
File Menu Functions ....................................... 13
G
Global Items ......................... ....... ...... ....... ...... 13
I
Input/Outp ut ............. .................... ................... 14
Installing the GUI Software ............................... 7
Installing the H ardware ... ...... ....... ...... ....... ........ 6
Internet Address ............................................... 3
M
Memory .......................................................... 22
Microchip Internet Web Site ............................. 3
Microchip World Wide Web (WWW) site. ......... 3
P
Parts Placement Diagram .............................. 37
Peripheral Organization .................................. 11
PICDEM™ MSC1 Hardware .......................... 37
Port Selecti on .... ...... ....... ................... ....... ...... 10
Programmable Switch Mode Controller
(PSMC) . ................... .................... ................... 20
R
Recommen ded Read ing . ...... ....... ...... ....... ...... .. 2
Required Items ................................................. 5
S
Sample Initialization Assembly Code ..............33
Schematics ..................................................... 36
Serial Communications with the
PICDEM™ MSC1 Evaluation Board ...............11
Setting the Prescaler ......................................30
Special Conventions .......................................12
Starting Communications with the
Evaluation Tool .................................................9
T
The Configuration Word Setup Tool Area .......22
Timers ......... ................................ ....................21
Triangle Waveform .........................................18
U
Using the Arbitrary Waveform Feature ...........28
Using the GUI Control Panel ............................9
W
Warranty Registration Card ..............................2
WWW Address .................................................3
Index
DS41178A-page 40 2001 Microchip Technology Inc.
M
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