HMS87C1202A datasheet(34/88 Pages) HYNIX

34 / 88 page

HMS87C130XA/120XA/110XA

Apr. 2001 ver1.0

The operation within data memory (RAM)

ASL, BIT, DEC, INC, LSR, ROL, ROR

Example; Addressing accesses the address 0135H.

983500

INC

!0035H

←RAM[035H]

(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

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; 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; X=015H

C645

LDA

45H+X

0F100H

data

0035H

0F102H

0F101H

data+1

→ data

address: 0035

data

15H

0F550H

data

→ A

data

35H

data

→ A

36H

→ X

data

5AH

0F551H

data

→ A

0F550H

45H+15H=5AH

HMS87C1202A Datasheet(PDF) 34 Page - Hynix Semiconductor

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