SNC353
Direct Drive Voice/Dual Tone Melody Controller
3
Block Diagram
ROM
Program/Speech
64K×10 bits
Address Pointers/ STACK
SRAM (128 nibbles)
Timer
ALU
IO1
Sampling
Rate Counter
Timing
Generator
Dual-Tone
Generator
OSC
PWM
D/A
IO3
Voice
Synthesizer
IO2
4
PIN ASSIGNMENT
Symbol
P13 ~ P10
P23 ~ P20
P33 ~ P30
VDD
GND
RST
OSC
BUO1/VO
BUO2
I/O
I
I/O
I/O
P
P
I
O
O
O
Function Description
Bit3 ~ Bit0 of Input port 1
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 / Crystal Out
Positive Output of PWM or DA output
Negative Output of PWM
Ver: 1.4
2
June 8, 2005