MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The Special Function Register (SFR) is the upper area of addressable memory, from address 0x80 to 0xFF. This area of memory can’t be used for data or program storage, but is instead a series of memory-mapped ports and registers.

Detailed explanation-2: -16-bit SFRs are composed of two consecutive addresses that contain the MSB and LSB (in either order) of the 16-bit register. Depending on the device, writing to the MSB or LSB “latches” the 16-bit value into the register.

Detailed explanation-3: -The special function registers are memory registers which is used for special dedicated functions. These registers perform various dedicated functions inside the PIC chip.

Detailed explanation-4: -DP (Data pointer register): Data Pointer can be used as a single 16-bit register (as DPTR) or two 8-bit registers (as DPL and DPH). The 8-bit data pointers are used for accessing internal RAM and SFR. The 16-bit data pointer is used for accessing external data memory.