eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
316
RR r
Rotate Right
Operation
Description
The
r
operand is any of the 8-bit CPU registers A, B, C, D, E, H, or L. The CPU manipu-
lates the contents of the
r
operand 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
r
operand.
Condition Bits Affected
Attributes
jj identifies the A, B, C, D, E, H, or L register and is assembled into one of the opcodes
indicated in Table 90.
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 r X2CB, kk
Table 90. Register and jj Opcodes for RR r Instruction (hex)
Register jj
A 1F
B 18
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