Zilog Z80380 Manual do Utilizador descarregar pdf (Página 178)

5-144

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

ROTATE LEFT (BYTE)

RL dst dst = R, IR, X

Operation: tmp ← dst

dst(0) ← C

C ← dst(7)

dst(n+1) ← tmp(n) for n = 0 to 6

The contents of the destination operand are concatenated with the Carry flag and together

they are rotated left one bit position. Bit 7 of the destination operand is moved to the Carry

flag and the Carry flag is moved to bit 0 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 7 was a 1; cleared otherwise

Addressing Execute

Mode Syntax Instruction Format Time Note

R: RL R 11001011 00010-r- 2

IR: RL (HL) 11001011 00010110 2+r

X: RL (XY+d) 11y11101 11001011 ——d— 00010110 4+r I

Field Encodings: r: per convention

y: 0 for IX, 1 for IY

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 267 268

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Zilog Z80380 Manual do Utilizador Página 178