Find the value of the CY flag after the execution ofthe following code. (a)MOV A,#85H ADD A,#92H (b) MOV A,#15H ADD A,#72H (c) MOV A,#0F5H ADD A,#52H (d)MOV A,#0FF INC A

Find the value of the CY flag after the execution ofthe following code. (a)MOV A,#85H ADD A,#92H (b) MOV A,#15H ADD A,#72H (c) MOV A,#0F5H ADD A,#52H (d)MOV A,#0FF INC A

asked 2021-02-28
Find the value of the CY flag after the execution ofthe following code.
(a)MOV A,#85H
ADD A,#92H
(b) MOV A,#15H
ADD A,#72H
(c) MOV A,#0F5H
ADD A,#52H
(d)MOV A,#0FF

Answers (1)

The Carry flag(CY) is set to 1 when there is carry from addition or borrow from substraction operation so
The Value Carry flag(CY) after the execution of given instructions is as follows
(a) CY = 1. because theresult from addition of 85H and 92H exceedesthe 8-bit.
(b) CY = 0. because thereis no carry out from addition operation.
(c) CY = 1. because there is acarry(5) from addition of F5H and 52H.
(d) CY = 0. the value ofaccumulator is FFH(255) is incrementing the value causes to resetto 0. but note that the Carry Flag is NOT set when the value "rollsover" from 255 to 0.
if you have any doubts, post the question.

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