8051 Specifications

8051 Specifications

In 1981, Intel Corporation introduced an 8-bit micro controller called the 8051. This micro controller had 128 bytes of RAM, 4K bytes of on-chip ROM, two timers, one serial port, and four ports (each 8-bits wide) all on a single chip. At the time it was also referred to as a “system on a chip.” The 8051 is an 8-bit processor, meaning that the CPU can work on only 8 bits of data at a time. Data larger than 8 bits has to be broken into 8-bit pieces to be processed by the CPU. The 8051 has a total of four I/O ports, each 8 bits wide.

The PS – 8051 board has the following hardware features:

• 8051 Micro controller operating at 11.0592 MHZ.
• 32KB powerful software monitor in 27C256 EPROM.
• 64KB on chip Flash memory (partially used by Firmware).
• Two 16 – bit programmable on chip Timer.
• 32 Programmable I/O pins (24 from 8255).
• 50 pin FRC connector for system bus expansion.
• 20 pin FRC connector for user interface from 8255.
• 9 pin D type connector for RS 232C interface.
• Six different selectable baud rates from 150 to 9600.
• One timer and external interrupt.
• 101 PC type keyboard for entering user address/data and for commands.
• Built in line – by – line Assemble and Disassemble.
• User – friendly software monitor for loading and executing programs.
• 8051 board supports Assembly language