ASM2012C –
VERY LOW-COST VOICE SYNTHESIZER WITH 4-BIT MICROPROCESSOR
1.0 General Description
The ASM2012C 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
u
u
u
u
u
u
u
u
u
u
u
u
Single power supply can operate from 2.4V through 5V
Internal Program ROM: 4K x 10-bit
1 sets of 16-bit DPR can access up to 64K x 10 bits data memory space
Data Registers:
•
96 x 4-bit data RAM (00-1Fh plus 40h-7Fh)
•
Unbanked special function registers (SFR) range: 20h-3Fh
I/O Ports:
•
PRA: 4-bit I/O Port A (2Bh)
•
PRB: 4-bit Output Port B (2Dh)
•
PRC: 4-bit Input Port C (2Fh)
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
1
Rev 1.0
1.2 Pin-Out
ASM2012C Pin-Out
PRC1
PRC0/RESET
I
I
STI
Std./O.D.
STI
Std./O.D.
STI
Std./O.D.
STI
Std./O.D.
Input port with programmable strong pull-low or weak pull-low or fix-input-
floating capability
Input port with programmable strong pull-low or weak pull-low or fix-input-
floating capability
Mask option selected as an external RESET pin with weak pull-low capability
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
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
RM mode Oscillator input
First Power supply during operation
Current Output of Audio
First Circuit Ground Potential
Second Circuit Ground Potential
Enter Test Mode. ( TEST = High )
Second Power supply during operation
Output type with standard or Open-Drain output
Input port with programmable strong pull-low or weak pull-low or fix-input-
floating capability
PRA3-1
PRA0/RESET
I/O
I/O
OSC
VDD1
COUT
GND1
GND2
TEST
VDD2
PRB0-3
PRC2-3
I
I
O
I
I
O
I
O
I
-
-
-
-
-
-
-
Std./O.D.
STI
Std./O.D.
1.3 Application circuit
4
Rev 1.0
Embedded System
京公网安备 11010802033920号
EEWORLD
