AT89C55WD-33AU ATMEL [ATMEL Corporation], AT89C55WD-33AU Datasheet - Page 3
AT89C55WD-33AU
Manufacturer Part Number
AT89C55WD-33AU
Description
8-bit Microcontroller with 20K Bytes Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT89C55WD-33AU.pdf
(35 pages)
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3. Block Diagram
1921D–MICRO–6/08
ALE/PROG
EA / V
PSEN
RST
V
GND
PP
CC
CONTROL
REGISTER
TIMING
AND
OSC
B
RAM ADDR.
REGISTER
INSTRUCTION
REGISTER
WATCH
DOG
ACC
TMP2
RAM
PORT 1 DRIVERS
PSW
P1.0 - P1.7
PORT 0 DRIVERS
PORT 1
LATCH
ALU
P0.0 - P0.7
PORT 0
LATCH
TMP1
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
PORT 2
LATCH
PORT 3 DRIVERS
PORT 2 DRIVERS
POINTER
P2.0 - P2.7
STACK
P3.0 - P3.7
PORT 3
LATCH
QUICK
FLASH
INCREMENTER
PROGRAM
PROGRAM
REGISTER
COUNTER
ADDRESS
BUFFER
DPTR
DUAL
PC
AT89C55WD
3
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