Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 145)

5-111

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

OR (BYTE)

OR [A,]src src = R, RX, IM, IR, X

Operation: A ← A OR src

A logical OR operation is performed between the corresponding bits of the source operand

and the accumulator and the result is stored in the accumulator. A 1 bit is stored wherever

either of the corresponding bits in the two operands is 1; otherwise a 0 bit is stored. The

contents of the source are unaffected.

Flags: S: Set if the most significant bit of the result is set; cleared otherwise

Z: Set if all bits of the result are zero; cleared otherwise

H: Cleared

P: Set if the parity is even; cleared otherwise

N: Cleared

C: Cleared

Addressing Execute

Mode Syntax Instruction Format Time Note

R: OR [A,]R 10110-r- 2

RX: OR [A,]RX 11y11101 1011010w 2

IM: OR [A,]n 11110110 ——n— 2

IR: OR [A,](HL) 10110110 2+r

X: OR [A,](XY+d) 11y11101 10110110 ——d— 4+r I

Field Encodings: r: per convention

y: 0 for IX, 1 for IY

w: 0 for high byte, 1 for low byte

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Zilog Z80380 Bedienungsanleitung Seite 145