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GMS81C5108 Datasheet, PDF (32/102 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS | |||
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GMS81C5108
Y indexed direct page (8 bit offset) â 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 â !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
3F35
JMP [35H]
35H
36H
~~
0E30AH
~~
0FA00H
0A
E3
NEXT
3F
35
~~ Â jump to address 0E30AH
~~
Â
0F100H
0F101H
0F102H
~~
0FA55H
D5
00
FA
data
Â
0FA00H+55H=0FA55H
~~
Â
data â A
Â
(6) Indirect Addressing
Direct page indirect â [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; G=0
X indexed indirect â [dp+X]
Processes memory data as Data, assigned by 16-bit pair
memory which is determined by pair data
[dp+X+1][dp+X] Operand plusX-register data in Direct
page.
ADC, AND, CMP, EOR, LDA, OR, SBC, STA
Example; G=0, X=10H
1625
ADC [25H+X]
35H
05
36H
E0
~~
0E005H
data
~~
0FA00H
16
25
~~ Â 0E005H
 25 + X(10) = 35H
~~
 A + data + C â A
JUNE 2001 Ver 1.0
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