AT89S51 Microcontroller

AT89S51 Microcontroller 

The AT89S51 is an 8-bit microcontroller from the 8051 family, developed by Atmel (now Microchip Technology). It is widely used for embedded control applications requiring moderate program memory, timers, and serial communication interfaces.

It is based on the 8051 architecture with an 8-bit CPU, integrating Flash program memory, SRAM, digital I/O ports, timers, and serial communication interfaces. The microcontroller is available in a 40-pin DIP or SMD package, making it suitable for industrial, consumer, and educational applications.

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Features

• 8-bit 8051-compatible CPU
• Operating voltage: 4.0 V – 5.5 V
• Maximum clock frequency: 24 MHz
• Program memory: 4 KB Flash (in-system programmable)
• Data memory: 128 bytes RAM
• I/O pins: 32 programmable digital I/O pins
• Timers/Counters: Two 16-bit timers
• Communication interfaces:
• Full-duplex UART (serial)
• Interrupt system: 6 interrupt sources
• Low-power modes: Idle and Power-down
• Package type: 40-pin DIP / 40-pin SMD

Applications

• Embedded control systems
• Industrial automation
• Sensor interfacing
• Robotics and motor control
• Serial communication projects
• Consumer electronics
• Educational and student projects