Zilog Z08470 Manual do Utilizador descarregar pdf (Página 174)

100

101

Z80 Instruction Set UM008007-0715

162

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

The contents of the s operand are compared with the contents of the Accumulator. If there

is a true compare, the Z flag is set. The execution of this instruction does not affect the

contents of 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 contains 63h, the HL register pair contains 6000h, and memory loca-

tion

6000h contains 60h, the instruction CP (HL) results in the PN flag in the F Register

resetting.

B 000

C 001

D 010

E 011

H 100

L 101

A 111

Instruction M Cycles T States 4 MHz E.T.

CP r 1 4 1.00

CP n 2 7(4, 3) 1.75

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

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

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

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 325 326

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