AT89S52_08 Datasheet, PDF (3/38 Pages) ATMEL Corporation – 8-bit Microcontroller with 8K Bytes In-System Programmable Flash

3. Block Diagram
V_CC
GND
RAM ADDR.
REGISTER
P0.0 - P0.7
PORT 0 DRIVERS
P2.0 - P2.7
PORT 2 DRIVERS
RAM
PORT 0
LATCH
PORT 2
LATCH
FLASH
AT89S52
B
REGISTER
ACC
STACK
POINTER
PROGRAM
ADDRESS
REGISTER
PSEN
ALE/PROG
EA / V_PP
RST
TMP2
TMP1
BUFFER
ALU
PSW
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PC
INCREMENTER
PROGRAM
COUNTER
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
WATCH
DOG
PORT 3
LATCH
PORT 1
LATCH
ISP
PORT
DUAL DPTR
PROGRAM
LOGIC
OSC
PORT 3 DRIVERS
PORT 1 DRIVERS
P3.0 - P3.7
P1.0 - P1.7
3
1919D–MICRO–6/08