SNC745 Datasheet Text
16-bit Voice Processor
1. INTRODUCTION
SNC745 is a 64mins two-channel speech/melody and 4-channel wave-table melody voice chip. It based on reduced 16-bit fixed-point DSP architecture. SNC745 provides user some necessary and efficient DSP instructions. Furthermore, SNC745 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 w w w w Power supply: 2.4V ~ 3.6V (for 2 battery application) 3.6V ~ 5.1V (for 3 battery application) Built-in a 16-bit DSP (Very Light Structure) Software-based voice/melody processing Rich Function Instruction Set System Clock
- 16MHz crystal or R-C type oscillator for system clock
- 0.25s real time clock is form 32768Hz crystal 8 MIPS CPU performance 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 RAM size: 2K- 16 bits High performance program ROM: 32K- 16 bits Data ROM size: 480K- 16 bits Total ROM size: 512K- 16 bits Maximum program size: 64K word 8 Interrupt Sources
- 4 for Internal Timer (timer0, 1, 2 and RTC)
- 4 for External (P0.0~P0.3) Two voice/melody channels Three 8-bit timer with auto-reload function Built in a 10-bit PWM Direct Drive circuit and a fixed current D/A output Sampling Rate: 6KHz ~16KHz 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) Built-in software melody synthesizer includes the dual-tone melody and 4-ch wave-table melody. Low Voltage Reset w w w w w w w w w w w w w w w
Ver. 1.3
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October 23, 2002
16-bit Voice Processor
3. PIN ASSIGNMENT
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