MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The program counter in the 8051 is 16 bits wide. This means that the 8051 can access program addresses 0000 to FFFFH, a total of 64K bytes of code.

Detailed explanation-2: -Program Counter and Data Pointer The 8051 contains two 16-bit registers: the program counter (PC) and the data pointer (DPTR). Each is used to hold the address of a byte in memory. Program instruction bytes are fetched from locations in memory that are addressed by the PC.

Detailed explanation-3: -The 8051 is an 8-bit microcontroller with 8 bit data bus and 16-bit address bus. The 16 bit address bus can address a 64K( 216) byte code memory space and a separate 64K byte of data memory space.