MC80F0204 Datasheet, PDF(34/126 Page) List of Unclassifed Manufacturers

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MC80F0204 Datasheet, PDF (34/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0104/0204

Preliminary

983501 INC !0135H

;A âROM[135H]

135H

data

0F100H

0F101H

0F102H

data+1 â data

address: 0135

8.4.5 Indexed Addressing

X indexed direct page (no offset) â {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}

;ACCâRAM[X].

35H

data

data â A

â 36H â X

X indexed direct page (8 bit offset) â dp+X

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

mand plus the data of X-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

115H

data

0E550H

data â A

3AH

data

0E550H

0E551H

â data â A

45H+0F5H=13AH

X indexed direct page, auto incrementâ {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}+

Y indexed direct page (8 bit offset) â 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 â !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

Mar. 2005 Ver 0.2

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