Description
AT89C52 – 8 bit Microcontroller belongs to Atmel’s 8051 families. AT89C52 has 8KB of Flash programmable and erasable read-only memory (PEROM) and 256 bytes of RAM. it has an endurance of 1000 Write/Erase cycles which means that it can be erased and programmed to a maximum of 1000 times.
Specifications of Atmel AT89C52 Microcontroller:
| Pin No | Function | Name | |||
| 1 | External count input to Timer/Counter 2, clock-out | T2 | P1.0 | ||
| 2 | Timer/Counter 2 capture/reload trigger and direction control | T2 EX | P1.1 | ||
| 3 | 8 bit input/output port (P1) pins | P1.2 | |||
| 4 | P1.3 | ||||
| 5 | P1.4 | ||||
| 6 | P1.5 | ||||
| 7 | P1.6 | ||||
| 8 | P1.7 | ||||
| 9 | Reset pin; Active high | Reset | |||
| 10 | Input (receiver) for serial communication | RxD | 8 bit input/output port (P3) pins | P3.0 | |
| 11 | Output (transmitter) for serial communication | TxD | P3.1 | ||
| 12 | External interrupt 1 | Int0 | P3.2 | ||
| 13 | External interrupt 2 | Int1 | P3.3 | ||
| 14 | Timer1 external input | T0 | P3.4 | ||
| 15 | Timer2 external input | T1 | P3.5 | ||
| 16 | Write to external data memory | Write | P3.6 | ||
| 17 | Read from external data memory | Read | P3.7 | ||
| 18 | Quartz crystal oscillator (up to 24 MHz) | Crystal 2 | |||
| 19 | Crystal 1 | ||||
| 20 | Ground (0V) | Ground | |||
| 21 |
8 bit input/output port (P2) pins/ High-order address bits when interfacing with external memory |
P2.0/ A8 | |||
| 22 | P2.1/ A9 | ||||
| 23 | P2.2/ A10 | ||||
| 24 | P2.3/ A11 | ||||
| 25 | P2.4/ A12 | ||||
| 26 | P2.5/ A13 | ||||
| 27 | P2.6/ A14 | ||||
| 28 | P2.7/ A15 | ||||
| 29 | Program store enable; Read from external program memory | PSEN | |||
| 30 | Address Latch Enable | ALE | |||
| Program pulse input during Flash programming | Prog | ||||
| 31 | External Access Enable; Vcc for internal program executions | EA | |||
| Programming enable voltage; 12V (during Flash programming) | Vpp | ||||
| 32 | 8 bit input/output port (P0) pins
Low-order address bits when interfacing with external memory |
P0.7/ AD7 | |||
| 33 | P0.6/ AD6 | ||||
| 34 | P0.5/ AD5 | ||||
| 35 | P0.4/ AD4 | ||||
| 36 | P0.3/ AD3 | ||||
| 37 | P0.2/ AD2 | ||||
| 38 | P0.1/ AD1 | ||||
| 39 | P0.0/ AD0 | ||||
| 40 | Supply voltage; 5V (up to 6.6V) | Vcc | |||
Package Includes:
1 x Atmel AT89C52 Microcontroller
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