Rabbit 2000 - 12.1 Serial Port Register Layout

122 Rabbit 2000/3000 Microprocessor
Description
Rotates to the right 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.
Bit 0 moves to the C flag, bits 1 through 7 move to the next lowest-order bit position, and the C flag moves to
bit 7. See figure below.
Figure 4: The bit logic for the RR instruction.
RR (HL)
RR (IX+d)
RR (IY+d)
Opcode Instruction Clocks Operation
CB 1E RR (HL) 10 (2,2,1,2,3) {(HL),CF} = {CF,(HL)}
DD CB d 1E RR (IX+d) 13 (2,2,2,2,2,3) {(IX+d),CF} = {CF,(IX+d)}
FD CB d 1E RR (IY+d) 13 (2,2,2,2,2,3) {(IY+d),CF} = {CF,(IY+d)}
Flags ALTD I/O
S Z L/V C F R SP S D
• • L • • • •
7
0
CF