Zilog Z80380 Manual do Utilizador descarregar pdf (Página 188)

5-154

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

RRC

ROTATE RIGHT CIRCULAR (BYTE)

RRC dst dst = R, IR, X

Operation: tmp ← dst

C ← dst(0)

dst(7) ← tmp(0)

dst(n) ← tmp(n+1) for n = 0 to 6

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

destination operand is moved to the bit 7 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: RRC R 11001011 00001-r- 2

IR: RRC (HL) 11001011 00001110 2+r

X: RRC (XY+d) 11y11101 11001011 ——d— 00001110 4+r I

Field Encodings: r: per convention

y: 0 for IX, 1 for IY

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 267 268

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