Question

What is described by this command: CJNE A,#00001111b, ROW1

(a) it masks the bit and then jumps to the label where ROW1 is written

(b) it makes the value of the accumulator 0FH and then jumps at the address where ROW1 label is written

(c) it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there if the value becomes equal

(d) it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there if the value is not equal

The question was asked in my homework.

My question is taken from Keyboard Interfacing in section 8051 Microcontroller of Microcontroller

Answer 1

The correct answer is (d) it compares the value of the accumulator with 0FH and jumps to the location where ROW1 label is there if the value is not equal

Explanation: This particular command CJNE A,#00001111b, ROW1 compares the value of the accumulator with OFH and jumps to ROW1 address if the value is not equal.