JNC stands for: (i) Jump if no carry, jumps if CY=0 (ii) Jump if carry

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Module 3: Instruction Set and Programming

20222m

JNC stands for:
(i) Jump if no carry, jumps if CY=0
(ii) Jump if carry, jumps if CY=1
(iii) Jump if no carry, jumps if CY=1
(iv) Jump if carry, jumps if CY=0

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Answer: (i) Jump if no carry, jumps if CY=0

Explanation: JNC = Jump if No Carry. In 8051, JNC rel : if PSW.CY =0 then PC←PC+offset, else next instruction. JC jumps if CY=1. Hence (i) is correct.

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