Zilog Z08470 Manual do Utilizador descarregar pdf (Página 162)

100

101

Z80 Instruction Set UM008007-0715

150

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 added to 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 carry from bit 3; otherwise, it is reset.

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

N is reset.

C is set if carry from bit 7: otherwise, it is reset.

Example

If the Accumulator contents are 16h, the Carry Flag is set, the HL register pair contains

6666h, and address 6666h contains 10h, then upon the execution of an ADC A, (HL)

instruction, the Accumulator contains

27h.

B 000

C 001

D 010

E 011

H 100

L 101

A 111

Instruction M Cycle T States 4 MHz E.T.

ADC A, r 1 4 1.00

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

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

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

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

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 325 326

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