SNC203
Direct Drive Speech Controller
3. Block Diagram
ROM
Program/Speech
32K×10 bits
Timing
OSC
Address Pointers/ STACK
Generator
SRAM (32 nibbles)
Sampling Rate Counter
Timer
ALU
Voice
PWM
D/A
Synthesizer
IO3
4. PIN ASSIGNMENT
Symbol
P33 ~ P30
VDD
I/O Function Description
I/O Bit3 ~ Bit0 of I/O port 3
P
P
I
O
O
O
Positive power supply
Negative power supply
Reset pin (active high)
Oscillator / Crystal Out
GND
RST
OSC
BUO1/VO
BUO2
Positive Output of PWM or DA output
Negative Output of PWM
3
Ver: 1.1
June 8, 2005