Zilog Z80380 Manual do Utilizador descarregar pdf (Página 189)

5-155

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

RRCW

ROTATE RIGHT CIRCULAR (WORD)

RRCW dst dst = R, RX, IR, X

Operation: tmp ← dst

C ← dst(0)

dst(15) ← tmp(0)

dst(n) ← tmp(n+1) for n = 0 to 14

The contents of the destination operand are rotated right one bit position. Bit 0 of the

destination operand is moved to the most significant bit position and also replaces the Carry

flag.

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: RRCW R 11101101 11001011 000010rr 2

RX: RRCW RX 11101101 11001011 0000110y 2

IR: RRCW (HL) 11101101 11001011 00001010 2+r

X: RRCW (XY+d) 11y11101 11001011 ——d— 00001010 4+r I

Field Encodings: rr: 00 for BC, 01 for DE, 11 for HL

y: 0 for IX, 1 for IY

1 2 ... 184 185 186 187 188 189 190 191 192 193 194 ... 267 268

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Zilog Z80380 Manual do Utilizador Página 189