Pokémon mini Development Documentation

RL = Rotate Left through Carry

Hex	Mnemonic	Cycles
CE 90	RL A	3
CE 91	RL B	3
CE 92 ll	RL [BR:ll]	5
CE 93	RL [HL]	4

Execute

A       = Register A
B       = Register B
[BR:ll] = Memory: (EP shl 16) or (BR shl 8) or #nn
[HL]    = Memory: (EP shl 16) or HL

; RL Ds
;
; Ds = Source/Destination

Ds = (Ds SLL 1) OR Carry

Description

“8-bits Destination” bits are rotated left by 1 through Carry.

Conditions

• Zero: Set when result is 0
• Carry: Set when old bit 7 is 1
• Negative: Set when bit 7 of the result is 1

Overflow remains unchanged

Examples

; A = 0x04
; SC = (Carry=0)
RL A
; A = 0x08
; SC = (Zero=0):(Carry=0):(Negative=0)

; B = 0x45
; SC = (Carry=1)
RL B
; B = 0x8B
; SC = (Zero=0):(Carry=0):(Negative=1)

; B = 0x84
; SC = (Carry=0)
RL B
; B = 0x08
; SC = (Zero=0):(Carry=1):(Negative=0)

; [HL] = 0x80
; SC = (Carry=0)
RL [HL]
; [HL] = 0x00
; SC = (Zero=1):(Carry=1):(Negative=0)

; [HL] = 0x80
; SC = (Carry=1)
RL [HL]
; [HL] = 0x01
; SC = (Zero=0):(Carry=1):(Negative=0)

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