Zilog Z08470 Bedienungsanleitung PDF herunterladen (Seite 166)

100

101

Z80 Instruction Set UM008007-0715

154

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, along with the Carry flag (C in the F Register) is subtracted from the con-

tents 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 reset if overflow; otherwise, it is reset.

N is set.

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

Example

If the Accumulator contains 16h, the carry flag is set, the HL register pair contains 3433h,

and address

3433h contains 05h, then upon the execution of an SBC A, (HL) instruction,

the Accumulator contains

10h.

B000

C001

D010

E011

H100

L101

A111

Instruction M Cycles T States 4 MHz E.T.

SBC A, r 1 4 1.00

SBC A, n 2 7(4, 3) 1.75

SBC A, (HL) 2 7 (4, 3) 1.75

SBC A, (IX+d) 5 19 (4, 4, 3, 5, 3) 4.75

SBC A, (lY+d) 5 19 (4, 4, 3, 5, 3) 4.75

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 325 326

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