GMS87C1102 datasheet(39/89 Pages) HYNIX

39 / 89 page

GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

Y indexed direct page (8 bit offset)

→

→ 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

→

→ !abs+Y

Sets the value of 16-bit absolute address plus Y-register

data as Memory. This addressing mode can specify mem-

ory in whole area.

Example; Y=55H

D500FA

LDA

!0FA00H+Y

(6) Indirect Addressing

Direct page indirect

→

→ [dp]

Assigns data address to use for accomplishing command

which sets memory data(or pair memory) by Operand.

Also index can be used with Index register X,Y.

JMP, CALL

Example;

3F35

JMP

[35H]

X indexed indirect

→

→ [dp+X]

Processes memory data as Data, assigned by 16-bit pair

m e m o ry w h ic h is d e t e rm in e d b y p a ir d a ta

[dp+X+1][dp+X] Operand plus

X-register data in Direct

page.

ADC, AND, CMP, EOR, LDA, OR, SBC, STA

Example; X=10H

1625

ADC

[25H+X]

0F900H

data

→ A

data

0FA55H

0FA00H+55H=0FA55H

0F902H

0F901H

35H

jump to address 0FC0AH

0FD00H

36H

0FC0AH

35H

0F905H

0FA00H

36H

0F905H

data

A + data + C → A

25 + X(10) = 35H

GMS87C1102 Datasheet(PDF) 39 Page - Hynix Semiconductor

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