Flag register contains data D5H. Interprete its meaning.
Answers
Explanation:
Flag register in 8085 microprocessor
Prerequisite – Registers of 8085 microprocessor
The Flag register is a Special Purpose Register. Depending upon the value of result after any arithmetic and logical operation the flag bits become set (1) or reset (0). In 8085 microprocessor, flag register consists of 8 bits and only 5 of them are useful.
The 5 flags are:
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The flag register is a special register in the microprocessor that contains various status flags that indicate the outcome of arithmetic and logical operations. The meaning of the value D5H in the flag register depends on how the bits are interpreted, as different bits correspond to different status flags. Assuming that the value D5H is in binary format, here's how to interpret the different bits:
Bit 7: Reserved
Bit 6: Reserved
Bit 5: The bit 5 is the flag for the auxiliary carry (AC) and is set when there is a carry between bits 3 and 4 during an addition or a borrow between bits 3 and 4 during a subtraction. In this case, the value of bit 5 is 1, indicating that there was an auxiliary carry.
Bit 4: Reserved
Bit 3: The bit 3 is the flag for the carry (CY) and is set when there is a carry out of the most significant bit during an addition or a borrow during a subtraction. In this case, the value of bit 3 is 1, indicating that there was a carry.
Bit 2: The bit 2 is the flag for the parity (P) and is set if the result of the operation has an even number of 1s in its binary representation. In this case, the value of bit 2 is 1, indicating that the result has an even number of 1s.
Bit 1: Reserved
Bit 0: The bit 0 is the flag for the zero (Z) and is set when the result of the operation is zero. In this case, the value of bit 0 is 1, indicating that the result is zero.
Therefore, the value D5H in the flag register indicates that there was an auxiliary carry, a carry, the result has an even number of 1s, and the result is zero.
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