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