SNC678 datasheet(4/14 Pages) SONIX

4 / 14 page

SNC678

4-Channel Speech Controller

3. Block Diagram

IO1

IO2

IO3

IO4

IO5

Sampling Rate Counter

× 4

Timing

Generator

Volume

Control

8bit D/A

Timer

SRAM (256 nibbles)

ALU

Voice

Synthesizer

IO6

PWM

Address Pointers/ STACK

OSC

ROM

Program/Speech/Melody/Instrument waveform

132K

×12 bits

4. PIN ASSIGNMENT

Symbol

I/O Function Description

P13 ~ P10

I/O Bit3 ~ Bit0 of I/O port 1

P23 ~ P20

I/O Bit3 ~ Bit0 of I/O port 2

P33 ~ P30

I/O Bit3 ~ Bit0 of I/O port 3

P43 ~ P40

I/O Bit3 ~ Bit0 of I/O port 4

P53 ~ P50

I/O Bit3 ~ Bit0 of I/O port 5

P63 ~ P60

I/O Bit3 ~ Bit0 of I/O port 6

VDD

Positive power supply

GND

Negative power supply

XIN

Crystal In

RST

Chip Reset (Active high)

XOUT/OSC

Crystal Out / Rosc In

CKSEL

Clock type select (Internal pull low)

‘L’ or floating

→ RC oscillator

‘H’

→Crystal

BUO1/VO1

Positive Output of PWM or DA1

BUO2/VO2

Negative Output of PWM or DA2

Ver: 1.2

August 26, 2003

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