AT89C51 Microcontroller

AT89C51 Microcontroller 

The AT89C51 is an 8-bit microcontroller based on the classic 8051 architecture, widely used in embedded control applications. It integrates a CPU, on-chip Flash program memory, RAM, I/O ports, timers, serial communication, and interrupt control on a single chip. The AT89C51 is known for its simplicity, reliability, and wide industry adoption, making it suitable for both educational use and industrial embedded systems.

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Features

• 8-bit 8051-compatible CPU architecture
• 4 KB on-chip Flash program memory
• 128 bytes of internal RAM
• 32 programmable I/O lines (4 × 8-bit ports)
• Two 16-bit timers/counters
• Full-duplex UART serial communication
• Multiple interrupt sources with priority control
• On-chip oscillator and clock circuitry
• Operates typically at up to 24 MHz
• Low power consumption with idle and power-down modes
• Available in DIP, PLCC, and SMD packages

Applications

• Embedded control systems
• Industrial automation and process control
• Home appliances and consumer electronics
• Access control and security systems
• Data acquisition and monitoring systems
• Educational and training projects
• Simple robotics and automation projects
• Communication and interface control modules