Zilog Z08470 Bedienungsanleitung PDF herunterladen (Seite 170)

100

101

Z80 Instruction Set UM008007-0715

158

Z80 CPU

User Manual

r identifies registers B, C–, D, E, H, L, or A specified in the assembled object code field,

as follows:

Description

A logical OR operation is performed between the byte specified by the s operand and the

byte contained in the Accumulator; the result is stored in the Accumulator.

Condition Bits Affected

S is set if result is negative; otherwise, it is reset.

Z is set if result is 0; otherwise, it is reset.

H is reset.

P/V is set if overflow; otherwise, it is reset.

N is reset.

C is reset.

Example

If the H Register contains 48h (0100 0100), and the Accumulator contains 12h (0001

0010), then upon the execution of an OR H instruction, the Accumulator contains 5Ah

(

0101 1010).

B 000

C 001

D 010

E 011

H 100

L 101

A 111

Instruction M Cycles T States 4 MHz E.T.

OR r 1 4 1.00

OR n 2 7 (4, 3) 1.75

OR (HL) 2 7 (4, 3) 1.75

OR (IX+d) 5 19 (4, 4, 3, 5, 3) 4.75

OR (lY+d) 5 19 (4, 4, 3, 5, 3) 4.75

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 325 326

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