Question

In 8051, the accumulator register contains 80H and B register contains 8FH. The content of the accumulator and status of the carry flag after the addition operation are respectively
1. 0FH, 1
2. 10FH, 0
3. FFH, 1
4. 10FH, 1
5.

Answer 1

Correct Answer - Option 1 : 0FH, 1

The correct answer is option 1.

A= 80H 
B= 8FH
[A] + [B] = 80H + 8FH = 1 0FH

          1000 0000

   +     1000 1111 

------------------------------

      1   0000 1111  (1 0FH)

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But accumulator is an 8-bit register
Accumulator = 0FH
carry flag= 1

Hence the correct answer is 0FH, 1.