INTEL 8051 MICRO-CONTROLLER

• The intel 8051 is an 8-bit micocontroller with 128 byte internal RAM & 4kb internal ROM.
• 8051 is a 40 pin DIP IC 
• It require +5v power supply
• max clock frequency rating is 12MHz
• It has 32 I/O ports & They are organised as 4 number of 8-bit parallel port
• It has harvard architecture in which the same address in different memory device or bank is used for program & data
• The architecture has two dedicated 16-bit pointers namely program counter (pc) & Data Pointer (DPTR)
• The PC is used as address pointer to access program instructions & it is automatically incremented after every byte of instruction fetch
• The DPTR is used as address pointer to read/write data in data memory & it is programmable using instructions 
• It has 16-bit address bus & 8-bit data bus
• They can address upto 64 k memory locations
• it supports 2 memory banks of 64kb each one for program & other for data
• It ha a separate 256 bytes internal RAM accessed by using 8-bit address