Preliminary

SNC749

16-bit Voice Processor

Ver. 1.8

March 6, 2007

3

1. INTRODUCTION

The SNC749 is a simply chip base on new DSP technology. SNC749 provide

simply and easy control functions for system manufactory. SNC749 also is a high

performance voice IC. That is built-in 64K word high speed ROM, and by different

model to built-in 64K word, 448K words low speed ROM, the maximum program size is

full ROM size include high-speed and low-speed ROM.

The SNC749 have three timer, one real time clock and one watchdog timer and

built-in a hi-performance software synthesizer to provide lot of voice effects, such as

hi-decompression engine to support from 1.5Kbps ~ 32Kbps compression rate for

speech and music, multi-channel voice synthesizer to provide 12-channel wave table

melody.

2. FEATURES

Power supply: 2.4V ~ 3.6V (for 2 batteries application)

3.6V ~ 5.1V (for 3 batteries application)

Built-in a new 16-bit DSP core with 16 MIPS CPU performance

Software-based voice/melody processing

Rich Function Instruction Set

System Clock

−

16MHz crystal or R-C type oscillator for system clock

I/O Ports:

−

24 I/O pins (P0.0~P0.15, P1.0~P1.7)

−

P0.15 with IR carrier signal

RAM size: 4K*16 bits

ROM size: 512KW

−

High performance program ROM: 64K*16 bits

−

Low speed ROM: 448KW

Maximum program size: Full ROM Size

3 Timer, 1 RTC, 1 WDT

- Timer With Individual pre-scalar and auto-reload function

- RTC with 0.25/0.5/1 sec period

- Watchdog Timer

9 Interrupt Sources

−

4 for Internal Timer (timer0, 1, 2 and RTC)

−

4 for External (P0.0~P0.3)

−

1 for DA (Push Pull DAC)

Two voice channels / 12 melody channels

Three 8-bit timer with auto-reload function

Built in a 10-bit Push-Pull DAC direct drive circuit

Internal regulator provided