which flag bit is reset, when flag resister content is D4H
Answers
Answer:
Explanation:
In 8085 microprocessor, flag register consists of 8 bits and only 5 of them are useful. ... These set of instructions will reset the sign flag to 0 as 40 – 30 is a positive number.
Answer:
The carry flag bit is reset when the flag register content is D4H.
Explanation:
Flag Bits
8085 is an 8-bit microprocessor that has a total of 8 flag bits out of which only 5 are useful and the rest 3 are undefined.
Each flag bit can be set to either 0 or 1 as per the outcome of the result.
Those five flags are as follows:
1 Carry flag (Cy):
This bit is set to 1 if the result contains a carry.
2. Auxiliary carry flag (AC)
It is useful in BCD addition. It is set to 1 if the result has an auxiliary carry.
3. Sign flag (S)
It is set to 1 if the result is negative otherwise it is zero/
4. Parity flag (P)
If the number of ones in the result is odd it is set to one otherwise zero.
5. Zero flags (Z).
It is set to 1 if the result has all zeroes otherwise it is not set.
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