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AT89C51

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Description

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

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
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