Zilog Z08470 User Manual
Page 238
Z80 Instruction Set
UM008007-0715
226
Z80 CPU
User Manual
r identifies registers B, C, D, E, H, L, or A assembled as follows in the object code field:
Description
The contents of operand m are rotated right 1 bit position through the Carry flag. The con-
tents of bit 0 are copied to the Carry flag and the previous contents of the Carry flag are
copied to bit 7. Bit 0 is the least-significant bit.
Condition Bits Affected
S is set if result is negative; otherwise, it is reset.
Z is set if result is 0; otherwise, it is reset.
H is reset.
P/V is set if parity even; otherwise, it is reset.
N is reset.
C is data from bit 0 of source register.
Example
The HL register pair contains
4343h
and memory location
4343h
and the Carry flag con-
tain the following data.
Register
r
B
000
C
001
D
010
E
011
H
100
L
101
A
111
Instruction
M Cycles
T States
4 MHz E.T.
RR r
2
8 (4, 4)
2.00
RR (HL)
4
15 (4, 4, 4, 3)
3.75
RR (IX+d)
6
23 (4, 4, 3, 5, 4, 3)
5.75
RR (lY+d)
6
23 (4, 4, 3, 5, 4, 3)
5.75
1
0
1
1
1
0
1
1
7
6
4
1
0
2
5
3
C
0