Question

Write instructions to make CY flag 0
- without using any register.​

Answer 1

Explanation:

Basically, you are given a set of instructions and the initial content of the registers and flags of 8085 microprocessor. You have to find the content of the registers and flag status after each instruction.

Initially,

Answer 2

Carry Flag (CY) – Carry is generated when performing n bit operations and the result is more than n bits, then this flag becomes set i.e. 1, otherwise it becomes reset i.e. 0.

During subtraction (A-B), if A>B it becomes reset and if (A<B) it becomes set.

Carry flag is also called borrow flag.

1-carry out from MSB bit on addition or borrow into MSB bit on subtraction

0-no carry out or borrow into MSB bit

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