Computer Science, asked by Soomaiqa3043, 1 year ago

How many times the ‘rl' instruction needs to be executed, in order to mimic the ‘swap' instruction in an 8051 microcontroller? 24 26 28 30?

Answers

Answered by Ishantomar
2
there r 9 times in an instruction gives by controller
Answered by ravilaccs
0

Answer:

The correct answer is - 4 times.

Explanation:

Many applications have a need to carry out a bitwise rotation of the operand. The 8051 microcontrollers also have rotation instructions like RR, RL, RRC, and RLC that have been specifically designed for this purpose. They give a program that allows the left or right rotation of the accumulator.A SWAP instruction has the higher and the lower nibble of a byte. Therefore, the RL command will have to be used 4 times. This will swap the higher nibble and the lower nibble exactly like it is for the SWAP instruction. However. using the using RL 4 times will take up 4 times more of the memory and the time.
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