JR

Relative jumps to the address. This means that it can only jump between 128 bytes ahead or behind. Can be conditional or unconditional. JR takes up one less byte than JP, but is also slower. Weigh the needs of the code at the time before choosing one over the other (speed vs. size).

Syntax

JP NN            ;unconditional jump
JP cond.,NN        ;conditional jump

Allowed Instructions

;Constants
JP NN        ;no contition
JR C,NN        ;jumps if C is set
JR NC,NN        ;jumps if C is reset
JR Z,NN        ;jumps if Z is set
JR NZ,NN    ;jumps if Z is reset

Effects

All flags preserved.

Uses

T-States

cc is condition: NZ, Z, NC, C, PO, PE, P, M

X

12

	condition met	condition not met
cc,X	12	7

See Also

BIT,CALL,CP,CPD,CPDR,CPI,CPIR,DJNZ,JP