SNC725

16-bit Voice Processor

Ver:1.2

October 23, 2002

1

1. INTRODUCTION

SNC725 is a 16mins two-channel speech/melody and 4-channel wave-table melody

voice chip. It based on reduced 16-bit fixed-point DSP architecture. SNC725 provides

user some necessary and efficient DSP instructions. Furthermore, SNC725 provide one

10-bit PWM and one 10-bit DA converter to driving speaker for speech/melody output.

User can select PWM or DA by programming DA/PWM control register, and only one

function can be active at the same time.

2. FEATURES

w

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

3.6V ~ 5.1V (for 3 battery application)

w

Built-in a 16-bit DSP (Very Light Structure)

w

Software-based voice/melody processing

w

Rich Function Instruction Set

w

System Clock

−

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

−

0.25s real time clock is form 32768Hz crystal

w

8 MIPS CPU performance

w

I/O Ports:

−

16 I/O pins (P0.0~P0.15) and 8 input pins (P1.0~P1.7)

−

P0.15 with IR carrier signal

w

RAM size: 2K*16 bits

w

High performance program ROM: 32K*16 bits

w

Data ROM size: 96K*16 bits

w

Total ROM size: 128K*16 bits

w

Maximum program size: 64K word

w

8 Interrupt Sources

−

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

−

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

w

Two voice/melody channels

w

Three 8-bit timer with auto-reload function

w

Built in a 10-bit PWM Direct Drive circuit and a fixed current D/A output

w

Sampling Rate: 6KHz ~16KHz

w

Built-in software voice synthesizer (multiple bit-rate solution 2Kbps, 3.6Kbps, 5Kbps,

6Kbps, 8Kbps, 10Kbps, 12Kbps, 14Kbps, 16Kbps, 20Kbps, 24Kbps and 29Kbps

@8K sampling rate)

w

Built-in software melody synthesizer includes the dual-tone melody and 4-ch

wave-table melody.

w

Low Voltage Reset