3. Block Diagram
SN52020
2-Channel Speech Controller
ROM
Program/Speech/Instrument waveform
Address Pointer
Timing
OSC
PC/Data Pointer/Stack/Speech Pointer Generator
SRAM
Sampling Rate
Timer
ALU
IO3
WDT
Voice
Synthesizer
Push Pull
4. PIN ASSIGNMENT
Symbol
P33, P32, P31, P30
VDD
GND
OSC/XIN
XOUT
CKSEL
BUO1
BUO2
RST
I/O Function Description
I/O Bit3 ~ Bit0 of I/O port 3
I Positive power supply
I Negative power supply
I Oscillator / Crystal In
O Crystal Out / 1Khz output
I Clock type select
‘L’ or floating → RC oscillator
‘H’ →Crystal
O Positive Output of Push Pull
O Negative Output of Push Pull
I RST=1 Reset Chip (Active H)
Ver: 1.0
4
March 2,2005