MICROPROCESSOR AND MICROCONTROLLER

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INTRODUCTION TO MICROPEOCESSOR

MODEL OF MICROPROCESSOR

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The processor status word of 8085 microprocessor has five flags namely:
A
S, Z, AC, P, CY
B
S, OV, AC, P, CY
C
S, Z, OV, P, CY
D
S, Z, AC, P, OV
Explanation: 

Detailed explanation-1: -8085 has five flags. Sign flag, zero flag, Auxiliary carry flag, Parity flag and Carry flag.

Detailed explanation-2: -In 8085 microprocessor, the flags register can have a total of eight flags. Thus a flag can be represented by 1 bit of information. But only five flags are implemented in 8085.

Detailed explanation-3: -These instructions can be classified into the following five functional categories: data transfer (copy) operations, arithmetic operations, logical operations, branching operations, and machine-control operations.

Detailed explanation-4: -The FLAGS register is the status register that contains the current state of a x86 CPU. The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.

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