GMS82516K datasheet(34/110 Pages) HYNIX

34 / 110 page

GMS81508B/16B/24B, GMS82512/16/24

MAY. 2001 Ver 2.0

(4) Absolute Addressing

→

→ !abs

Absolute addressing sets corresponding memory data to

Data, i.e. second byte (Operand I) of command becomes

lower level address and third byte (Operand II) becomes

upper level address.

With 3 bytes command, it is possible to access to whole

memory area.

ADC, AND, CMP, CMPX, CMPY, EOR, LDA, LDX,

LDY, OR, SBC, STA, STX, STY

Example;

0735F0

ADC

!0F035H

←ROM[0F035H]

The operation within data memory (RAM)

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

Example; Addressing accesses the address 0135H regard-

less of G-flag.

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

0F100H

data

0F035H

0F102H

0F101H

A+data+C

→ A

address: 0F035

0F100H

data

135H

0F102H

0F101H

data+1

→ data

address: 0135

data

115H

0E550H

data

→ A

data

35H

data Æ A

36H Æ X

GMS82516K Datasheet(PDF) 34 Page - Hynix Semiconductor

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