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PM_Opc_ROL
Jose I Romero edited this page Dec 6, 2019
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1 revision
== ROL = Rotate Left ==
Hex | Mnemonic | Cycles |
---|---|---|
CE 94 | ROL A | 12 |
CE 95 | ROL B | 12 |
CE 96 nn | ROL [N+#nn] | 20 |
CE 97 | ROL [HL] | 16 |
A = Register A
B = Register B
[N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
[HL] = Memory: (I shl 16) or HL
; ROL Ds
;
; Ds = Source/Destination
Ds = (Ds SHL 1) OR (Ds SHR 7)
"8-Bits Destination" bits are rotated left by 1.
Zero: Set when result is 0
Carry: Set when bit 0 of the result is 1
Sign: Set when bit 7 of the result is 1
Overflow remain unchanged
; A = 0x04
ROL`` ``A
; A = 0x08
; F = (Zero=0):(Carry=0):(Sign=0)
; B = 0x45
ROL`` ``B
; B = 0x8A
; F = (Zero=0):(Carry=0):(Sign=1)
; B = 0x84
ROL`` ``B
; B = 0x15
; F = (Zero=0):(Carry=1):(Sign=0)
; [HL] = 0x80
ROL`` ``[HL]
; [HL] = 0x01
; F = (Zero=0):(Carry=1):(Sign=0)