SNC520
One Channel Direct Drive Speech Controller
3 Block Diagram
ROM
Program/Speech
32K×10 bits
Address Pointers/ STACK
Timing
OSC
Generator
SRAM (64 nibbles)
Sampling Rate Counter
PWM
D/A
Voice
Timer
ALU
Synthesizer
IO port 2
IO port 3
4 PIN ASSIGNMENT
Symbol
P23 ~ P20
P33 ~ P30
VDD
I/O Function Description
I/O Bit3 ~ Bit0 of I/O port 2
I/O Bit3 ~ Bit0 of I/O port 3
P
P
I
Positive power supply
Negative power supply
Reset pin (active high)
Oscillator Input
GND
RST
OSC
I
BUO1/VO
BUO2
O
O
Positive Output of PWM or DA output
Negative Output of PWM
2
Ver: 1.0
November 26, 2002