Here's a Detailed Description of its key Features:

8-Bit RISC Architecture: The AT89C2051 follows an 8-bit Reduced Instruction Set Computing (RISC) architecture, providing a simple and efficient instruction set for programming.

Memory: 2 KB Flash Memory: This memory is used for storing the program code. It is non-volatile, allowing the retention of the program even when power is turned off.

128 Bytes RAM: Random Access Memory (RAM) is used for temporary data storage during program execution.

Clock Speed: The microcontroller supports a clock speed of up to 24 MHz.

On-Chip Oscillator and Clock Circuitry: It includes an on-chip oscillator and clock circuitry, reducing the need for external components for clock generation.

Peripheral Features: Two 16-bit Timer/Counters: These timers/counters are versatile and can be used for tasks such as time measurement, pulse width modulation (PWM), and event counting.

Four Parallel I/O Ports: These ports (P1, P2, P3, and P4) can be used for interfacing with external devices.

Communication Ports: The microcontroller supports serial communication, making it suitable for applications that require data transfer.

Programming and Flash Memory Protection: The AT89C2051 supports in-system programming, allowing the user to program the device after it has been placed in the target system. It also features a Flash memory lock bit for protection against accidental programming.

Low Power Consumption: The microcontroller is designed for low power consumption, making it suitable for battery-operated devices.

Operating Voltage: The typical operating voltage is 4.0V to 6.0V.

Package Type: The AT89C2051 comes in a Dual In-line Package (DIP) with 20 pins, facilitating easy integration into breadboards and circuit designs.