GMS82524 Datasheet, PDF (29/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS82512/16/24
HYUNDAI MicroElectronics
C645 LDA 45H+X
Example; G=0
3F35 JMP
[35H]
3AH
data
~~
0E550H
C6
0E551H
45
˜
~~
— data → A
–
45H+0F5H=13AH
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 memo-
ry in whole area.
Example; Y=55_H
D500FA LDA !0FA00H+Y
0F100H
D5
0F101H
00
0F102H
FA
~~
0FA55H
data
–
0FA00H+55H=0FA55H
~~
—
data → A
˜
(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
35H
36H
~~
0E30AH
~~
0FA00H
0A
E3
NEXT
3F
35
~~ ^—
–
jump to
address 0E30AH
~~
X indexed indirect → [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=10_H
1625 ADC [25H+X]
35H
05
36H
E0
~~
0E005H
data
~~
0FA00H
16
25
~~ ^{— 0E005H}
– 25 + X(10) = 35H
~~
˜ A + data + C → A
Y indexed indirect → [dp]+Y
Processes memory data as Data, assigned by the data
[dp+1][dp] of 16-bit pair memory paired by Operand in Di-
rect pageplus Y-register data.
ADC, AND, CMP, EOR, LDA, OR, SBC, STA
Example; G=0, Y=10_H
26
FEB. 2000 Ver 1.00