6F-3 NO.7, LANE 75, TA-AN ROAD, SEC.1, TAIPEI, TAIWAN, R.O.C.
http://www.aplusinc.com.tw
台北市大安路一段75巷7號6F-3 TEL:886-2-27818277 FAX:886-2-27815779
ASM0402C
DATA SHEET
Rev 1.0
1
ASM0402C – VERY LOW-COST VOICE SYNTHESIZER WITH 4-BIT MICROPROCESSOR
1.0 General Description
The ASM0402C is very low cost voice synthesizer with 4-bit microprocessor. It has various features
including 4-bit ALU, ROM, RAM, I/O ports, timers, clock generator, watchdog timer(WDT), voice
synthesizer, etc. It consists of 22 instructions in the device. With CMOS technology and halt function
can minimize power dissipation. Its architecture is similar to RISC, with two stages of instruction
pipeline. It allows all instructions to be executed in a single cycle, except for program branches and
data table read instructions (which need two instruction cycles).
1.1 Feature
Single power supply can operate from 2.4V through 5V
Internal Program ROM: 2K x 10-bit
1 sets of 14-bit DPR can access up to 16K x 10 bits data memory space
Data Registers:
• 48 x 4-bit data RAM (00-1Fh plus 40h-4Fh)
• Unbanked special function registers (SFR) range: 20h-3Fh
I/O Ports:
• PRA: 2-bit I/O Port A (2Bh)
On-chip clock generator: Resistive Clock Drive(RM)
Timer: 1
• Timer0: a 9-bit auto-reload timer/counter
Stack: 2-level subroutine nesting
HALT and Release from HALT function to reduce power consumption
Watch Dog Timer (WDT)
Instruction: 1-cycle instruction except for table read and program branches which are 2-cycles
Number of instruction: 22
The Voice function can be implemented by microprocessor instruction
• One 8-bit COUT output for ASMxxxxx
ASM0402C
Rev 1.0
2
FIGURE 1.1 : Block Diagram of ASM0402C
COUT
OSC
VDD/GND
ROM
1
PC[11:0]
ROM Latch
Instruction
Latch
Instruction
Decoder
0
PCH(8) PCL(4)
PCLATCH(8)
DPR3,2,1 Program
DLATCH(10)
Clock Generator
Power on Reset
Test select
P1,P2,P3,P4
enter test mode
Timer0(9)
Reset Chip
Stack
(
12
)
Data Bus[3:0
]
Instruction Bus [9:0]
ROM_ADDR[13:0]
ROM_Data[9:0]
Data Bus[3:0]
Control Signal
ADDR[13:0]
=00b
(ADDR[13:12])
PRASL(2)
weak or strong
pull-low for PRA
(Data)
Instruction Bus [9:0]
Instruction Bus [9:0]
( Voice synthesizer )
One-Channel
SRAM
(48 x 4)
40h-4Fh
(2-Level)
ALU(4)
Register(4)
Accumlator
(
4
)
Immediate
(
4
)
DPR[13:0]
RESET pin
Reset Chip
PRA0
00h-1Fh
PRA(2)
COUT
ASM0402C
Rev 1.0
3
FIGURE 1.2 : External ROM Map of ASM0402C
Data ROM
12bit x 2 STACK
Reset Vector
03FFFh(16Kx10-bits)
007FFh(2K)
00000h-007FFh
Pro
g
ram and data ROM
14-bit Data Pointer
PC[11:0]
00000h-03FFFh
Reserved for Testing 00080h-003FFh
00400h
00000h
00080h
ASM0402CASM0402C
Rev 1.0
4
1.2 Pin-Out
ASM0402C Pin-Out
VDD I - Power supply during operation
PRA1 I/O STI
Std./O.D.
I/O port with programmable strong pull-low or weak pull-low or fix-input-
floating capability
Output type with standard or Open-Drain output
PRA0/RESET I/O STI
Std./O.D.
I/O port with programmable strong pull-low or weak pull-low or fix-input-
floating capability
Output type with standard or Open-Drain output
Mask option selected as an external RESET pin with weak pull-low capability
OSC I - RM mode Oscillator input
COUT O - Current Output of Audio
GND I - Circuit Ground Potential
TEST O - Enter Test Mode. ( TEST = High )
1.3 Application circuit
ASM0402C
ASM0402C
Rev 1.0
5
1.4 Bonding Diagram
ASM0402C Pad Location Chip Size: X=1560+100 (um), Y=1030+100 (um)
PAD # PAD Name X Y PAD # PAD Name X Y
1COUT -509.92 -430.32 6 TEST_PAD 507.6 -430.32
2RA_PAD[1] -203.2 -430.32 7VDD 677.52 -430.32
3RA_PAD[0]/RESET
-9.04 -430.32
4OSC_PAD 117.25 -430.32
5GND -347.6 -430.32
ASM0402C
CHIP SIZE: X= 1560+100(um) , Y= 1030+100(um)
16K x 10 bit ROM
4 5 6 7 3 2 1
ASM0402C
Rev 1.0
6
1.5 DC Characteristics for ASMxxxxx
SYMBOL PARAMETER VDD MIN. TYP. MAX. UNIT CONDITION
VDD OPERATING
VOLTAGE 2.4 3 5 V depending on Freq.
31
Isb STANDBY 51
uA 4MHz, RM
in HALT Mode
32
Iop
SUPPLY
CURREN
TOPERATING 57mA 4MHz, RM
IO Floating
33
59
Iih INPUT CURRENT
/Internal pull low 5 -5.2
uA
4MHz, RM
in HALT Mode
(IO Ports with
weak pull-high
pull-low)
3-3
Ioh OUTPUT HIGH
CURRENT 5-8
37
Iol OUTPUT LOW
CURRENT 520
mA 4MHz, RM
(IO ports)
dF/F FREQUENCY
STABILITY -10 10 %
Fosc(3v)-
Fosc(2.4v)
Fosc (3v)
dF/F Fosc VARIATION -20 20 % VDD=3V,
Rosc=910k, 4MHz
FIGURE 1.3 : Frequency Range for Rosc in RM mode
Resistor(k ohm) 1200 1000 820 470
3v Freq.(MHz) 3.125 3.785 4.445 7.2
Rosc & Freq.
3.125
3.785
4.445
7.2
0
2
4
6
8
0 200 400 600 800 1000 1200 1400
Rosc k ohm
Freq. MHz
ASM0402C
