Assembly之instruction之JUMP

JMP 　　 　 Jump unconditionally

Syntax　 　JMP  label

Operation 　　PC + 2 × offset −> PC

Description

　　The 10-bit signed offset contained in the instruction LSBs is added to the program counter.

Status Bits

　　Status bits are not affected.

Hint:

　　This one-word instruction replaces the BRANCH instruction in the range of −511 to +512 words relative to the current program counter.

 

JNE 　　Jump if not equal

JNZ 　　Jump if not zero

Syntax   JNE  label; JNZ label

Operation 　　If Z = 0: PC + 2 × offset −> PC
　　　　　　　 If Z = 1: execute following instruction
Description

　　The status register zero bit (Z) is tested. If it is reset, the 10-bit signed offset contained in the instruction LSBs is added to the program counter. If Z is set, the next instruction following the jump is executed.

Status Bits 　　Status bits are not affected.

Example　　Jump to address TONI if R7 and R8 have different contents.

1 CMP R7,R8 　; COMPARE R7 WITH R8

2 JNE TONI 　 ; if different: jump

3 ...... 　　 ; if equal, continue