SNC11D
One Channel Direct Drive Speech Controller
3 Block Diagram
ROM
Program/Speech
384K×10 bits
Address Pointers/ STACK
Timing
OSC
Generator
SRAM (64 nibbles)
Sampling Rate Counter
PWM
Voice
ALU
D/A
Synthesizer
Input port 1
IO port 2
IO port 3
4 PIN ASSIGNMENT
Symbol
P13 ~ P10
P23 ~ P20
P33 ~ P30
VDD
I/O Function Description
Bit3 ~ Bit0 of Input port 1
I/O Bit3 ~ Bit0 of I/O port 2
I/O Bit3 ~ Bit0 of I/O port 3
I
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: 13
June 8, 2005