Zilog Z80380 - Manual (Page 145)

5-111
Z380 ™
U SER ' S M ANUAL Z ILOG
DC-8297-03
OR
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