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Atmel
AT89C51-24PC - AT89C51 40-Pin 24MHz 4kb 8-bit Microcontroller Technical Data - Buy AT89C51-24PC
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Photograph
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Features
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 Compatible with MCS-51 Products
4K Bytes of In-System Reprogrammable Flash Memory
Fully Static Operation: 0 Hz to 24 MHz
Three-level Program Memory Lock
128 x 8-bit Internal RAM
32 Programmable I/O Lines
Two 16-bit Timer/Counters
Six Interrupt Sources
Programmable Serial Channel
Low-power Idle and Power-down Modes
40-pin DIP
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Pin Description
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Pin Number
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Description
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1 - 8
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P1.0 - P1.7 - Port 1
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9
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RST - Reset
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10 - 17
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P3.0 - P3.7 - Port 3
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18
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XTAL2 - Crystal
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19
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XTAL1 - Crystal
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20
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GND - Ground
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21 - 28
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P2.0 - P2.7 - Port 2
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29
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PSEN - Program Store Enable
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30
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ALE - Address Latch Enable
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31
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EA - External Access Enable
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32 - 39
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P0.7 - P0.1 - Port 0
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40
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Vcc - Positive Power Supply
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Pin Layout
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Dimensional Drawing
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Technical Data
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Data Sheet
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Atmel - Data Sheet for AT89C51-24PC
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Application Notes
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Atmel - 80 Series Application Notes
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Integrated Circuits