Rabbit 2000 - Rrc (Hl)

90 Rabbit 2000/3000 Microprocessor
Description
Rotates to the right the data whose address is:
• the data in word register HL, or
• the sum of the data in index register IX and a displacement d,or
• the sum of the data in index register IY and a displacement d.
Each bit in the register moves to the next lowest-order bit position (bit 7 moves to bit 6, etc.) while bit 0
moves to both bit 7 and the CF. See Figure 4 below.
RRC (HL)
RRC (IX+d)
RRC (IY+d)
Opcode Instruction Clocks Operation
CB 0E RRC (HL) 10 (2,2,1,2,3) (HL) = {(HL)[0],(HL)[7,1]};
CF = (HL)[0]
DD CB d 0E RRC (IX+d) 13 (2,2,2,2,2,3) (IX + d) = {(IX + d)[0],
(IX + d)[7,1]};
CF = (IX + d)[0]
FD CB d 0E RRC (IY+d) 13 (2,2,2,2,2,3) (IY + d) = {(IY + d)[0],
(IY + d)[7,1]};
CF = (IY + d)[0]
Flags ALTD I/O
S Z L/V C F R SP S D
• • L • • • •
Figure 4: The bit logic of the RRC instruction.
CF70