MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -Flag Register: Flag register in 8051 is called the program status word (PSW) It is an 8-bit Register. Four of the flags are called conditional Flags that indicate some conditions that result after the execution of the instruction.

Detailed explanation-2: -The PSW (program status word) indicates your system’s general status. There are six different types of system PSWs that provide diagnostic information. Each one has an old and new value.

Detailed explanation-3: -PSW (program status word) register The program status word (PSW) register is an 8-bit register. It is also referred to as the flag register. Although the PSW register is 8 bits wide, only 6 bits of it are used by the 8051. The two unused bits are user-definable flags.

Detailed explanation-4: -The PCON or Power Control register, as the name suggests is used to control the 8051 Microcontroller’s Power Modes and is located at 87H of the SFR Memory Space. Using two bits in the PCON Register, the microcontroller can be set to Idle Mode and Power Down Mode.