ASM2006C

Rev 1.0

2002/2/6

1

1.0 General Description

The ASM2006C 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 16-bit DPR can access up to 64K 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 ASM2006C