Jump Instructions
Short jump instruction AJMP addr11
PC←addr11, jump range 2k
Long jump instruction LJMP addr16
PC←addr16, jump range 64k
Indirect jump instruction JMP @A+DPTR
PC←（A）＋（DPTR）
Relative transfer instruction SJMP rel
Conditional branch instructions
JZ rel ；（A）＝0，transfer
JNZ rel ; (A) ≠ 0, transfer
JC rel ; if C=1, transfer
JNC rel ; if C=0, transfer
JB bit, rel; if bit=1, transfer
JNB bit, rel; if bit=0, transfer
JBC bit, rel; if bit=1, transfer and bit=0
Compare Not Equal Jump Instruction
CJNE A, #data, rel; (A)=#data, continue C←0 (A)＞#data, transfer to C←0 (A)＜#data, transfer to C←1
Features: Only when <, C←1
CJNE A, direct, rel
CJNE Rn,#data,rel
CJNE @Ri, #data,rel
Decrement 1, if not equal to 0, jump instruction
DJNZ Rn, rel ;
DJNZ direct, rel
Example: Delay subroutine
delay： MOV R7, #03H
delay0: MOV R6, #19H
delay1： DJNZ R6, delay1
DJNZ R7, delay0
RET
Call subroutine instruction
Short call instruction ACALL addr11
Long call instruction LCALL addr16
Subroutine return instruction RET
Interrupt return instruction RETI
No operation instruction NOP
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