Previous Year Question
Which 8051 instruction combines a conditional jump with a bit-clearing operation, jumping if the specified bit is set and then clearing that bit after the jump condition is checked?
Correct answer: D
Explanation
JBC means Jump if Bit is set and Clear bit. If the addressed bit is 1, the 8051 clears it and branches to the target; if it is 0, execution continues without the jump.
Step-by-step solution
Correct Answer
D — JBC
Explanation
JBC means Jump if Bit is set and Clear bit. If the addressed bit is 1, the 8051 clears it and branches to the target; if it is 0, execution continues without the jump.
Key Concept
JBC Instruction
Exam Point
JBC = Jump on Bit + Clear.
Exam tip
JBC = Jump on Bit + Clear.
Quick method
JBC = Jump on Bit + Clear.