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AT89C55WD-24PU - AT89C55WD 40-Pin 24MHz 20kb 8-bit Microcontroller Technical Data - Buy AT89C55WD-24PU

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AT89C55WD-24PU - AT89C55WD 40-Pin 24MHz 20kb 8-bit Microcontroller

Features

arrowCompatible with MCS-51 Products

arrow20K Bytes of In-System Reprogrammable Flash Memory

arrow4V to 5.5V Operating Range

arrowFully Static Operation: 0 Hz to 24 MHz

arrowThree-level Program Memory Lock

arrow256 x 8-bit Internal RAM

arrow32 Programmable I/O Lines

arrowThree 16-bit Timer/Counters

arrowEight Interrupt Sources

arrowProgrammable Serial Channel

arrowLow-power Idle and Power-down Modes

arrowHardware Watchdog Timer

arrowDual Data Pointer

arrowPower-off Flag

arrow40-pin DIP


Pin Layout
AT89C55 Pin Description

Pin Description
Pin Number Description
1 - 8 P1.0 - P1.7 - Port 1
9 RST - Reset
10 - 17 P3.0 - P3.7 - Port 3
18 XTAL2 - Crystal
19 XTAL1 - Crystal
20 GND - Ground
21 - 28 P2.0 - P2.7 - Port 2
29 PSEN - Program Store Enable
30 ALE - Address Latch Enable
31 EA - External Access Enable
32 - 39 P0.7 - P0.1 - Port 0
40 Vcc - Positive Power Supply

Dimensional Drawing
PDIP40 Dimension Drawing

Technical Data