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8051 Instruction Set Manual

JNB

The JNB instruction branches to the specified address if the specified bit operand has a value of 0. Otherwise, execution continues with the next instruction. No flags are affected by this instruction.

See Also: JB

JNB bit, offset
C AC F0 RS1 RS0 OV   P
Bytes 3
Cycles 2
Encoding
00110000 bit offset
Operation 
JNB
PC = PC + 3
IF (bit) = 0
  PC = PC + offset
Example 
JNB P1.3, LABEL

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