Atmel 8051 AT89C51 AVR 40 Pin DIP Microcontroller

The AT89C51 microcontroller is an 8-bit MCU from Atmel’s 8051 family, widely used in embedded systems and electronics projects. It features 4KB of Flash memory, 128 bytes of RAM, and can be reprogrammed up to 1000 times, making it a reliable and cost-effective choice for learning, prototyping, and small-scale applications.

Port Details of AT89C51 Microcontroller:

This 40-pin IC has four bi-directional ports (P0, P1, P2, P3). Except for P0 which requires external pull-ups, the remaining ports have built-in pull-ups for easy interfacing. These ports are bit-addressable, allowing individual pin control. Port P0 and P2 provide low and high byte addresses when connected with external memory, while Port 3 supports special functions such as serial communication (UART), hardware interrupts, and timer inputs. With six interrupt sources and two timers, the AT89C51 ensures efficient real-time performance.

Key Features and Specifications of AT89C51:

• 8-bit microcontroller – Compatible with MCS-51™ architecture
• 4KB Flash memory, endurance up to 1000 write/erase cycles
• 128 x 8-bit internal RAM for smooth operation
• Fully static operation: 0 Hz to 24 MHz oscillator frequency
• Three-level program memory lock for protection
• 32 programmable I/O lines for flexible interfacing
• Two 16-bit Timer/Counters and six interrupt sources
• Inbuilt UART for serial communication with programmable baud rates
• Low-power idle and power-down modes for energy efficiency
• Maximum operating voltage: 6.6V

Applications of AT89C51 Microcontroller:

The AT89C51 is commonly used in automation systems, instrumentation, communication devices, and embedded training projects. Its robust design and low-power modes make it ideal for both educational purposes and professional product development.

Other Atmel Microcontrollers:

AT89S52, ATmega328P