Monday, February 29, 2016

8051 JNC Instruction

Jump if Carry not set

InstructionJNC relative address
FunctionJump if Carry not set
Encoding0 0 1 0 1 0 0 1 A7...A0
OperationPC = PC + 2
IF (C) = 0
PC = PC + relative address
DescriptionIf the carry flag is a 0, JNC branches to the address indicated; otherwise, it proceeds with the next instruction. The branch destination is computed by adding the signal relative-displacement in the second instruction byte to the PC, after incrementing the PC twice to point to the next instruction. The carry flag is not modified.
Flags AffectedC AC F0 RS1 RS0 OV P
ExampleThe carry flag is set. The following instruction sequence,
clears the carry and causes program execution to continue at the instruction identified by the label LABEL2.
Bytes: Number of bytes required to encode the instruction.
Cycles: Number of instruction cycles required to execute the instruction. Note that there are 12 oscillator cycles to one instruction cycle on a standard 8051.
Encoding: Lists the byte encoding for the instruction.
Operation: Lists, step-by-step, the operations performed by the instruction.
Flags Affected: are highlighted in Bold

Related topics:
8051 Boolean Variable Manipulation Instructions   |   8051 CPL Instruction   |   8051 CLR Instruction   |   8051 SETB Instruction   |   8051 ORL Instruction   |   8051 ANL Instruction   |   8051 MOV Instruction   |   8051 JC Instruction   |   8051 JBC Instruction   |   8051 JB Instruction   |   8051 JNB Instruction

List of topics: 8051

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