A
PLUS MAKE YOUR PRODUCT A-PLUS
ASM2506C
DATA SHEET
A
PLUS INTEGRATED CIRCUITS INC.
Address:
3 F-10, No. 32, Sec. 1, Chenggung Rd., Taipei,
Taiwan 115, R.O.C.
(115) 32 3 10.
TEL: 886-2-2782-9266
FAX: 886-2-2782-9255
WEBSITE :
http: //www.aplusinc.com.tw
Sales E-mail:
sales@aplusinc.com.tw
Technology E-mail:
service@aplusinc.com.tw
ASM2506C
Rev 1.0 2002/5/22
1
ASM2506C
VERY LOW-COST VOICE SYNTHESIZER WITH 4-BIT MICROPROCESSOR
1.0 General Description
The ASM2506C 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: 4K x 10-bit
1 sets of 17-bit DPR can access up to 80K x 10 bits data memory space
Data Registers:
64 x 4-bit data RAM (00-1Fh plus 40h-5Fh)
Unbanked special function registers (SFR) range: 20h-3Fh
I/O Ports:
PRA: 4-bit I/O Port A (2Bh)
PRB: 2-bit Output Port B (2Dh)
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 ASM2506C
ASM2506C
Rev 1.0 2002/5/22
4
1.2 Pin-Out
ASM2506C Pin-Out
VDD
I
-
Power supply during operation
PRA3-1
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 )
PRB0-1
O
Std./O.D.
Output type with standard or Open-Drain output
1.3 Application circuit
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