Nintendo DMG-01 - Game Boy Console Manual page 102

3.3.6. Rotates & Shifts
6. RL n
Description:
Rotate n left through Carry flag.
Use with:
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 7 data.
Opcodes:
Instruction
RL
RL
RL
RL
RL
RL
RL
RL
Page 102
Parameters
A
B
C
D
E
H
L
(HL)
Game Boy
Opcode Cycles
CB 17 8
CB 10 8
CB 11 8
CB 12 8
CB 13 8
CB 14 8
CB 15 8
CB 16 16
TM
CPU Manual
V 1.01