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Atmel Electronic Components Datasheet

89C55 Datasheet

8-Bit Microcontroller with 20K Bytes Flash

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AT89C55
Features
Compatible with MCS-51™ Products
20K Bytes of In-System Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
Fully Static Operation: 0 Hz to 33 MHz
Three-Level Program Memory Lock
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Low Power Idle and Power Down Modes
Description
The AT89C55 is a low-power, high-performance CMOS 8-bit microcomputer with 20K
bytes of Flash programmable and erasable read only memory. The device is manu-
factured using Atmel’s high density nonvolatile memory technology and is compatible
with the industry standard 80C51 instruction set and pinout. The on-chip Flash allows
the program memory to be reprogrammed in-system or by a conventional nonvolatile
memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic
chip, the Atmel AT89C55 is a powerful microcomputer which provides a highly flexible
and cost effective solution to many embedded control applications.
(continued)
Pin Configurations
PDIP
8-Bit
Microcontroller
with 20K Bytes
Flash
AT89C55
PQFP/TQFP
PLCC
0580D-A–12/97
4-169


Atmel Electronic Components Datasheet

89C55 Datasheet

8-Bit Microcontroller with 20K Bytes Flash

No Preview Available !

Block Diagram
VCC
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
PSEN
ALE/PROG
EA / VPP
RST
B
REGISTER
ACC
STACK
POINTER
PROGRAM
ADDRESS
REGISTER
TMP2
TMP1
ALU
PSW
INTERRUPT, SERIAL PORT,
AND TIMER BLOCKS
TIMING
AND
CONTROL
INSTRUCTION
REGISTER
PORT 1
LATCH
PORT 3
LATCH
OSC
PORT 1 DRIVERS
PORT 3 DRIVERS
P1.0 - P1.7
P3.0 - P3.7
BUFFER
PC
INCREMENTER
PROGRAM
COUNTER
DPTR
4-170 AT89C55


Part Number 89C55
Description 8-Bit Microcontroller with 20K Bytes Flash
Maker ATMEL Corporation
PDF Download

89C55 Datasheet PDF






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