GMS81C1102 / GMS81C1202
3F35
JMP
[35H]
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.
35H
36H
0A
This is same with above (2). Use Y register instead of X.
FC
jump to address 0FC0AH
➋
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.
0FC0AH
0FD00H
NEXT
~
~
~
~
➊
Example; Y=55H
3F
35
D500FA LDA
!0FA00H+Y
0F900H
0F901H
0F902H
D5
➊
00
X indexed indirect → [dp+X]
FA
0FA00H+55H=0FA55H
Processes memory data as Data, assigned by 16-bit pair
memory which is determined by pair data
[dp+X+1][dp+X] Operand plusꢁX-register data in Direct
page.
~
~
~
~
➋
0FA55H
data
data → A
➌
ADC, AND, CMP, EOR, LDA, OR, SBC, STA
Example; X=10H
1625
ADC
[25H+X]
(6) Indirect Addressing
Direct page indirect → [dp]
35H
05
F9
36H
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.
0F905H
➋
~
~
~
~
25 + X(10) = 35
➊
H
0F905H
data
JMP, CALL
Example;
~
~
~
~
0FA00H
16
25
A + data + C → A
➌
36
Jan. 2002 ver 2.0
HYNIX [ HYNIX SEMICONDUCTOR ]
