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AT89C51 40-Pin 24MHz 4kb Microcontroller Datasheet
| Photograph |
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| Features |
- 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 Layout |
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| Pin Description |
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Pin Number
|
Description
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|
1 - 8
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P1.0 - P1.7 - Port 1
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9
|
RST - Reset
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10 - 17
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P3.0 - P3.7 - Port 3
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18
|
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
|
Vcc - Positive Power Supply
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| Dimensional Drawing |
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| Technical Data |
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Datasheet
Application Notes
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Integrated Circuits