Rabbit 2000 - RL (IX+D)

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