Instruction Reference Manual
115
Description
Rotates to the left with the C flag the data whose address is:
•
the data in HL, or
•
the sum of the data in IX and a displacement d, or
•
the sum of the data in IY and a displacement d.
Bits 0 through 6 move to the next highest-order bit position (bit 0 moves to bit 1, etc.) while the C flag moves
to bit 0 and bit 7 moves to the C flag. See Figure 1 below.
Figure 1: The bit logic of the RL instruction.
Example
If HL contains 0x4545, the byte in the memory location 0x4545 is 0110 1010, and the C flag is set, then after
the execution of the operation
RL (HL)
the byte in memory location 0x4545 will contain 1101 0101 and the C flag will be reset.
RL (HL)
RL (IX+
d
)
RL (IY+
d
)
Opcode
Instruction
Clocks
Operation
CB 16
RL (HL)
10 (2,2,1,2,3)
{CF,(HL)} = {(HL),CF}
DD CB
d
16
RL (IX+
d
)
13 (2,2,2,2,2,3)
{CF,(IX +
d
)} = {(IX +
d
),CF}
FD CB
d
16
RL (IY+
d
)
13 (2,2,2,2,2,3)
{CF,(IY +
d
)} = {(IY +
d
),CF}
Flags
ALTD
I/O
S
Z
L/V
C
F
R
SP
S
D
•
•
L
•
•
•
•
7
0
CF
Содержание 2000
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