DEC

Decrement Memory by One

Operation:  M - 1 -> M

N V - B D I Z C
/ . . . . . / .
Addressing ModeAssembly Language FormOP CODENo. BytesNo. Cycles
ZeroPageDEC $FF$C625
ZeroPage,XDEC $FF,X$D626
AbsoluteDEC $FFFF$CE36
Absolute,XDEC $FFFF,X$DE37

For penalty cycles on the 65816, check the desired addressing mode.