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AT89C51 Microcontroller IC

AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC - ICs - Integrated Circuits & Chips - Core Electronics
AT89C51 Microcontroller IC
₹107

(inc GST)

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  • SKU: FR-05-646
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AT89C51 is an 8-bit microcontroller and belongs to Atmel's 8051 families. ATMEL 89C51 has 4KB of Flash programmable and erasable read only memory (PEROM) and 128 bytes of RAM. It can be erased and program to a maximum of 1000 times. In 40 pin AT89C51, there are four ports designated as P1, P2, P3, and P0. All these ports are 8-bit bi-directional ports, i.e., they can be used as both input and output ports. Except for P0 which needs external pull-ups, rest of the ports have internal pull-ups. When 1s are written to these port pins, they are pulled high by the internal pull-ups and can be used as inputs. These ports are also bit addressable and so their bits can also be accessed individually. Port P0 and P2 are also used to provide low byte and high byte addresses, respectively, when connected to external memory. Port 3 has multiplexed pins for special functions like serial communication, hardware interrupts, timer inputs and read/write operation from external memory. AT89C51 has an inbuilt UART for serial communication. It can be programmed to operate at different baud rates. Including two timers & hardware interrupts, it has a total of six interrupts.


Pin Description

Pin Number

Pin Name

Description

1

P1.0

0th pin of PORT P1

2

P1.1

1st pin of PORT P1

3

P1.2

2nd pin of PORT P1

4

P1.3

3rd pin of PORT P1

5

P1.4

4th pin of PORT P1

6

P1.5

5th pin of PORT P1

7

P1.6

6th pin of PORT P1

8

P1.7

7th pin of PORT P1

9

RST

Reset pin of the Microcontroller

10

(RXD) P3.0

0th pin of PORT P3 or Receiver pin of Microcontroller

11

(TXD) P3.1

1st pin of PORT P3 or Transmitter pin of Microcontroller

12

(INT0) P3.2

2nd pin of PORT P3 or External Interrupt 0 of MCU

13

(INT1) P3.3

3rd pin of PORT P3 or External Interrupt 1 of MCU

14

(T0) P3.4

4th pin of PORT P3 or Timer 0 interrupt of MCU

15

(T1) P3.5

5th pin of PORT P3 or Timer 1 interrupt of MCU

16

(WR) P3.6

6th pin of PORT P3 or Write to External data memory pin

17

(RD) P3.7

7th pin of PORT P3 or Read from External data memory pin

18

XTAL2

External crystal pin 2 of Microcontroller

19

XTAL1

External crystal pin 1 of Microcontroller

20

GND

Ground pin of MCU

21

P2.0(A8)

0th pin of PORT P2 or High-order Address bit 8 of MCU

22

P2.1(A9)

1st pin of PORT P2 or High-order Address bit 9 of MCU

23

P2.2(A10)

2nd pin of PORT P2 or High-order Address bit 10 of MCU

24

P2.3(A11)

3rd pin of PORT P2 or High-order Address bit 11 of MCU

25

P2.4(A12)

4th pin of PORT P2 or High-order Address bit 12 of MCU

26

P2.5(A13)

5th pin of PORT P2 or High-order Address bit 13 of MCU

27

P2.6(A14)

6th pin of PORT P2 or High-order Address bit 14 of MCU

28

P2.7(A15)

7th pin of PORT P2 or High-order Address bit 15 of MCU

29

PSEN

Program store enable pin, Read external program memory

30

ALE/PROG

Address Latch Enable/ Program Pulse input for flashing

31

EA/VPP

 Access Enable voltage/Program enable voltage

32

P0.7(AD7)

7th pin of PORT P0 or Low-order Address bit 7 of MCU

33

P0.6(AD6)

6th pin of PORT P0 or Low -order Address bit 6 of MCU

34

P0.5(AD5)

6th pin of PORT P0 or Low -order Address bit 5 of MCU

35

P0.4(AD4)

6th pin of PORT P0 or Low -order Address bit 4 of MCU

36

P0.3(AD3)

3rd pin of PORT P0 or Low -order Address bit 3 of MCU

37

P0.2(AD2)

2nd pin of PORT P0 or Low -order Address bit 2 of MCU

38

P0.1(AD1)

1st pin of PORT P0 or Low -order Address bit 1 of MCU

39

P0.0(AD0)

0th pin of PORT P0 or Low -order Address bit 0 of MCU

40

Vcc

Supply pin of MCU

Features

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