SNC735

16-bit Voice Processor

Ver: 1.2

October 23, 2002

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1. INTRODUCTION

SNC735 is a 32mins two-channel speech/melody and 4-channel wave-table melody

voice chip. It based on reduced 16-bit fixed-point DSP architecture. SNC735 provides

user some necessary and efficient DSP instructions. Furthermore, SNC735 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

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

3.6V ~ 5.1V (for 3 battery application)

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

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Software-based voice/melody processing

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Rich Function Instruction Set

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System Clock

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

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0.25s real time clock is form 32768Hz crystal

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8 MIPS CPU performance

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I/O Ports:

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

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P0.15 with IR carrier signal

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RAM size: 2K*16 bits

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High performance program ROM: 32K*16 bits

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Data ROM size: 224K*16 bits

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Total ROM size: 256K*16 bits

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Maximum program size: 64K word

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8 Interrupt Sources

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

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

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Two voice/melody channels

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Three 8-bit timer with auto-reload function

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

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Sampling Rate: 6KHz ~16KHz

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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)

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

wave-table melody.

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Low Voltage Reset