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.

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

♦ Low Voltage Reset

♦ Low Voltage Detect

♦ Sampling Rate: 8KHz ~16KHz

♦ Built-in software voice synthesizer (LRC5： 1.5K, 1.72K, 2K, 2.4K, 3K, 4K DRC： 5K, 6K SN： 8K MSADPCM： 35K PCM： 80K AUDIO32_16K： 16K, 20K, 24K, 28K, 32K)

♦ Built-in software melody synthesizer includes the dual-tone melody and 12-channel wave-table melody.