eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
315
RR (IX/Y+d)
Rotate Right
Operation
Description
The (
IX/Y
+
d
) operand is an 8-bit value at the memory location specified by the contents
of the Index Register, IX or IY, added to the two’s-complement displacement
d
. The CPU
manipulates the contents of this memory location, (
IX/Y
+
d
), by rotating them right one
bit position. The CPU next copies the contents of bit 0 into the Carry Flag and copies the
previous contents of the Carry Flag into bit 7 of the memory location, (
IX/Y
+
d
).
Condition Bits Affected
Attributes
S Set if result is negative; reset otherwise.
Z Set if result is 0; reset otherwise.
H Reset.
P/V Set if parity is even; reset otherwise.
N Reset.
C Data from bit 0 of the source.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
RR (IX+d)X 7 DD, CB, dd, 1E
RR.S (IX+d)1 8 52, DD, CB, dd, 1E
RR.L (IX+d)0 8 49, DD, CB, dd, 1E
RR (IY+d)X 7 FD, CB, dd, 1E
RR.S (IY+d)1 8 52, FD, CB, dd, 1E
RR.L (IY+d)0 8 49, FD, CB, dd, 1E
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