Inter-m PW-9242N Service Manual page 4

BLOCK DIAGRAM
V
CC
GND
REGISTER
PSEN
TIMING
ALE/PROG
AND
CONTROL
EA / V
PP
RST
OSC
PORT 0 DRIVERS
RAM ADDR.
RAM
REGISTER
B
ACC
TMP2
PSW
INSTRUCTION
REGISTER
PORT 1 DRIVERS
P1.0 - P1.7
P0.0 - P0.7
PORT 2 DRIVERS
PORT 2
PORT 0
LATCH
LATCH
TMP1
ALU
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PORT 1
LATCH
PORT 3 DRIVERS
2
P2.0 - P2.7
QUICK
FLASH
PROGRAM
STACK
ADDRESS
POINTER
REGISTER
BUFFER
PC
INCREMENTER
PROGRAM
COUNTER
DPTR
PORT 3
LATCH
P3.0 - P3.7