Zilog Z80380 - Manual (Page 185)

5-151
Z380 ™
U SER ' S M ANUAL Z ILOG
DC-8297-03
RR
ROTATE RIGHT (BYTE)
RR dst dst = R, IR, X
Operation: tmp
←
dst
dst(7)
←
C
C
←
dst(0)
dst(n)
←
tmp(n+1) for n = 0 to 6
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 bit 7 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: RR R 11001011 00011-r- 2
IR: RR (HL) 11001011 00011110 2+r
X: RR (XY+d) 11y11101 11001011 ——d— 00011110 4+r I
Field Encodings: r: per convention
y: 0 for IX, 1 for IY