Zilog Z80380 - Manual (Page 186)

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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