Reset P3.0 P3.1 8 bit input/output port (P3) pins Timer2 external input Write to external data memory Read from external data memory Reset pin Active high Input (receiver) for serial RxD communication Output (transmitter) for TxD serial communication External interrupt 1 Int0 Including two timers & hardware interrupts, it has a total of six interrupts. It can be programmed to operate at different baud rates. AT89C51 has an inbuilt UART for serial communication. Port 3 has multiplexed pins for special functions like serial communication, hardware interrupts, timer inputs and read/write operation from external memory. Port P0 and P2 are also used to provide low byte and high byte addresses, respectively, when connected to an external memory. These ports are also bit addressable and so their bits can also be accessed individually.Īdapter Banana Jack Electric Bead Trimmer HDMI Cable Membrane Keypad Micro Switch Scientific Calculator SMPS Telephone Turbidity Sensor USB Connector. When 1s are written to these port pins, they are pulled high by the internal pull-ups and can be used as inputs. Except P0 which needs external pull-ups, rest of the ports have internal pull-ups. All these ports are 8-bit bi-directional ports, i.e., they can be used as both input and output ports. In 40 pin AT89C51, there are four ports designated as P1, P2, P3 and P0. It can be erased and program to a maximum of 1000 ATMEL 89C51 has 4KB of Flash programmable and erasable read only memory (PEROM) and 128 bytes of RAM. Log in Create new account Request new passwordĪutomatic Custom Display on LCD using AVR I2C in AVR Wireless communicationĪT89C51 is an 8-bit microcontroller and belongs to Atmel's 8051 family. ATMEL 89C51 | AT89C51 Microcontroller Pin Diagram & Description - EngineersGarage
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