ZiLOG Z80380 User Manual page 186

Z
ILOG
RRW
ROTATE RIGHT (WORD)
RRW dst
← dst
Operation: tmp
← dst(0)
C
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
Mode Syntax
R: RRW R
RX: RRW RX
IR: RRW (HL)
X: RRW (XY+d)
Field Encodings: rr: 00 for BC, 01 for DE, 11 for HL
y: 0 for IX, 1 for IY
5-152
dst = R, RX, IR, X
Instruction Format
11101101 11001011 000110rr
11101101 11001011 0001110y
11101101 11001011 00011010
11y11101 11001011 ——d— 00011010
Execute
Time Note
2
2
2+r
4+r I
DC-8297-03
Z380 ™
U ' M
SER S ANUAL