Zilog Z08470 Manual de usuario descargar pdf (Pagina 164)

100

101

Z80 Instruction Set UM008007-0715

152

Z80 CPU

User Manual

r identifies registers B, C, D, E, H, L, or A assembled as follows in the object code field:

Description

The s operand is subtracted from the contents of the Accumulator, and 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 set if borrow from bit 4; otherwise, it is reset.

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

N is set.

C is set if borrow; otherwise, it is reset.

Example

If the Accumulator contents are 29h, and the D Register contains 11h, then upon the exe-

cution of a SUB D instruction, the Accumulator contains

18h.

B 000

C 001

D 010

E 011

H 100

L 101

A 111

Instruction M Cycle T States 4 MHz E.T.

SUB r 1 4 1.00

SUB n 2 7 (4, 3) 1.75

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

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

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

1 2 ... 159 160 161 162 163 164 165 166 167 168 169 ... 325 326

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Zilog Z08470 Manual de usuario Pagina 164

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