GMS81C2012 datasheet(36/107 Pages) HYNIX

36 / 107 page

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

983501

INC

!0135H

←ROM[135H]

(5) Indexed Addressing

X indexed direct page (no offset)

→

→ {X}

In this mode, a address is specified by the X register.

ADC, AND, CMP, EOR, LDA, OR, SBC, STA, XMA

Example; X=15H, G=1

LDA

{X}

;ACC

←RAM[X].

X indexed direct page, auto increment

→

→ {X}+

In this mode, a address is specified within direct page by

the X register and the content of X is increased by 1.

LDA, STA

Example; G=0, X=35H

LDA

{X}+

X indexed direct page (8 bit offset)

→

→ dp+X

This address value is the second byte (Operand) of com-

mand plus the data of

-register. And it assigns the mem-

ory in Direct page.

ADC, AND, CMP, EOR, LDA, LDY, OR, SBC, STA

STY, XMA, ASL, DEC, INC, LSR, ROL, ROR

Example; G=0, X=0F5H

C645

LDA

45H+X

Y indexed direct page (8 bit offset)

→

→ dp+Y

This address value is the second byte (Operand) of com-

mand plus the data of Y-register, which assigns Memory in

Direct page.

This is same with above (2). Use Y register instead of X.

Y indexed absolute

→

→ !abs+Y

Sets the value of 16-bit absolute address plus Y-register

data as Memory.This addressing mode can specify memo-

ry in whole area.

Example; Y=55H

0F100H

data

135H

0F102H

0F101H

data+1

→ data

address: 0135

data

115H

0E550H

data

→ A

data

35H

data Æ A

36H Æ X

data

3AH

0E551H

data

→ A

0E550H

45H+0F5H=13AH

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