AT89C51 Microcontroller IC

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.

₹ 95.00 95.0 INR ₹ 95.00 Tax Included

₹ 95.00 Tax Included

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15 Days Warranty
Please note that this item is only covered by a standard supplier warranty against manufacturing defects for a period of 15days from the time of delivery.

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

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AT89C51 Microcontroller IC

₹ 95.00 95.0 INR ₹ 95.00 Tax Included

₹ 95.00 Tax Included

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