at89s51-33sc ATMEL Corporation, at89s51-33sc Datasheet - Page 3

• Manufacturer Part Number: at89s51-33sc
• Description: At89s51, 8-bit Microcontroller With 4k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

3. Block Diagram
2487C–MICRO–03/05
ALE/PROG
EA / V
PSEN
RST
GND
V
PP
CC
CONTROL
REGISTER
TIMING
AND
OSC
B
RAM ADDR.
REGISTER
INSTRUCTION
REGISTER
WATCH
DOG
ACC
TMP2
RAM
PORT 3 DRIVERS
PSW
P3.0 - P3.7
PORT 0 DRIVERS
PORT 3
LATCH
ALU
P0.0 - P0.7
PORT 0
LATCH
TMP1
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PORT 2
LATCH
PORT 1 DRIVERS
PORT 1
LATCH
PORT 2 DRIVERS
POINTER
P2.0 - P2.7
STACK
P1.0 - P1.7
FLASH
PORT
ISP
INCREMENTER
DUAL DPTR
PROGRAM
PROGRAM
REGISTER
PROGRAM
COUNTER
ADDRESS
LOGIC
BUFFER
PC
AT89S51
3