IC80C51
IC80C31
P2.0-P2.7
P0.0-P0.7
P2
DRIVERS
P0
DRIVERS
VCC
ADDRESS
DECODER
& 128
ADDRESS
DECODER
&
P2
LATCH
P0
LATCH
RAM ADDR
REGISTER
BYTES RAM
4K ROM
PROGRAM
ADDRESS
REGISTER
STACK
POINT
B
ACC
REGISTER
PROGRAM
COUNTER
PCON SCON TMOD TCON
TMP2
TMP1
TH0
TL0
TH1
TL1
SBUF
IE
IP
INTERRUPT BLOCK
SERIAL PORT BLOCK
TIMER BLOCK
PC
INCREMENTER
ALU
PSW
BUFFER
DPTR
PSEN
ALE
RST
EA
TIMING
AND
CONTROL
P3
LATCH
P1
LATCH
OSCILLATOR
P3
DRIVERS
P1
DRIVERS
XTAL1
XTAL2
P3.0-P3.7
P1.0-P1.7
Figure 4. IC80C51/31 Block Diagram
S3-4
Integrated Circuit Solution Inc.
MC001-0B