IS89C52
ISSI
P2.0-P2.7
P0.0-P0.7
®
Vcc
P2
DRIVERS
P0
DRIVERS
GND
ADDRESS
DECODER
& 256
BYTES RAM
ADDRESS
DECODER
&
8K FLASH
3 LOCK BITS
&
32 BYTES
ENCRYPTION
RAM ADDR
REGISTER
P2
LATCH
P0
LATCH
B
REGISTER
STACK
POINT
ACC
PROGRAM
ADDRESS
REGISTER
PCON SCON
T2CON TH0
TL1
TH2
RCAP2L SBUF
TMOD TCON
TL0
TH1
TL2 RCAP2H
IE
IP
TMP2
TMP1
PROGRAM
COUNTER
INTERRUPT BLOCK
SERIAL PORT BLOCK
TIMER BLOCK
ALU
PC
INCREMENTER
PSW
BUFFER
PSEN
ALE/PROG
RST
EA/VPP
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
DPTR
P3
LATCH
OSCILLATOR
XTAL1
XTAL2
P3
DRIVERS
P1
LATCH
P1
DRIVERS
P3.0-P3.7
P1.0-P1.7
Figure 4. IS89C52 Block Diagram
4
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98