Rev 1.0

1

ASM7306C/8406C

1.0 General Description

The

ASM7306C/8406C 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 cycle, to RISC, with two stages of instruction pipeline. It allows all instructions to be in

a executed single 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 5.5V

Internal Program ROM: 4K x 10-bit

1 sets of 18-bit DPR can access up to 256K 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 ASM7306C/8406C

- VERY LOW-COST VOICE SYNTHESIZER WITH 4-BIT MICROPROCESSOR

ASM7306C/8406C