MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

983501 INC !0135H

;A ←ROM[135H]

135H

data

~~

0F100H

98

0F101H

35

0F102H

01

Ã

~~

À

data+1 → data

þ

address: 0135

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

D4

LDA {X}

;ACC←RAM[X].

115H

data

~~

0E550H

D4

À

~~

þ

data → A

MC80F0704/0708/0804/0808

35H

data

~~

DB

À

~~

data → A

þ 36H → X

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

This address value is the second byte (Operand) of command plus

the data of X-register. And it assigns the memory 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

3AH

data

~~

0E550H

C6

0E551H

45

Ã

~~

À data → A

þ

45H+0F5H=13AH

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

DB

LDA {X}+

Y indexed direct page (8 bit offset) → dp+Y

This address value is the second byte (Operand) of command 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 memory in whole ar-

ea.

Example; Y=55H

October 31, 2011 Ver 1.03

35

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