Rrw rotate right (word) – Zilog Z80380 User Manual
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Z380
™
U
SER
'
S
M
ANUAL
DC-8297-03
Z
ILOG
RRW
ROTATE RIGHT (WORD)
RRW dst
dst = R, RX, IR, X
Operation:
tmp
←
dst
C
←
dst(0)
dst(15)
←
C
dst(n)
←
tmp(n+1) for n = 0 to 14
The contents of the destination operand are concatenated with the Carry flag and together
they are rotated right one bit position. Bit 0 of the destination operand is moved to the Carry
flag and the Carry flag is moved to the most significant bit of the destination.
Flags:
S:
Set if the most significant bit of the result is set; cleared otherwise
Z:
Set if the result is zero; cleared otherwise
H:
Cleared
P:
Set if parity of the result is even; cleared otherwise
N:
Cleared
C:
Set if the bit rotated from bit 0 was a 1; cleared otherwise
Addressing
Execute
Mode
Syntax
Instruction Format
Time
Note
R:
RRW R
11101101 11001011 000110rr
2
RX:
RRW RX
11101101 11001011 0001110y
2
IR:
RRW (HL)
11101101 11001011 00011010
2+r
X:
RRW (XY+d)
11y11101 11001011 ——d— 00011010
4+r
I
Field Encodings:
rr: 00 for BC, 01 for DE, 11 for HL
y:
0 for IX, 1 for IY