GMS87C1102 datasheet(37/89 Pages) HYNIX

37 / 89 page

GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

12.4 Addressing Mode

The GMS87C1201 and GMS81C1202 use six addressing

modes.

• Register addressing

• Immediate addressing

• Direct page addressing

• Absolute addressing

• Indexed addressing

• Register-indirect addressing

Below example is shown for GMS81C1202.

(1) Register Addressing

(2) Immediate Addressing

→

→ #imm

In this mode, second byte (operand) is accessed as a data

immediately.

Example:

0435

ADC

#35H

E45535

LDM

35H,#55H

(3) Direct Page Addressing

→

→ dp

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

Example;

C535

LDA

35H

←RAM[35H]

(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]

A+35H+C

→ A

MEMORY

0F900H

data

← 55H

data

0035H

0F902H

0F901H

data

0035H

0F851H

data

→ A

0F850H

0F900H

data

0F035H

0F902H

0F901H

A+data+C

→ A

address: 0F035

GMS87C1102 Datasheet(PDF) 37 Page - Hynix Semiconductor

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