Introduction To Microcontroller 8051 and Main Features of Microcontroller 8051

Thursday, October 18, 2012

Microcontroller 8051

Intel designed Micro controller 8051 in 1980. It was an 8 bit Micro controller. It includes some standard on chip peripherals , timers, counters and UART's (Universal Asynchronous Receiver Transmitter).
This Micro controller have 4 Killo bytes on chip ROM that is program memory and 128 bytes of data memory. It is most popular Micro controller used in Embedded Systems.
Also Read: What is Difference Between Microcontroller & Microprocessor

Features of Microcontroller 8051:

Following are the main features of Micro controller 8051 which makes it most efficient Microcontroller chip:

It Includes Boolean Processing Engine. Thus internal registers and RAM can carry Boolean logic operations directly and efficiently.
It gives us many functions in a single chip. (For example: CPU,RAM,ROM,I/O, Interrupt, Timer etc)
It have 8 bit Data bus.
It have 8 bit Stack Pointer.
It have 16 bit Program Counter.
It have 16 bit address bus which can access almost 65,536 memory locations.
Data memory or RAM of 128 bytes.(On-Chip).
Program Memory or ROM of 4 KB.(On Chip).
Bi-Directional I/O port of 4 bytes.
It has 4 separate Register Sets.
Serial Port or UART.
It features Power Saving Mode which saves power.
Two Timers/Counters each of 16 bit.
Internal and External Interrupt Sources.
2 level interrupt priority.