MC80F0424 Datasheet, PDF (41/135 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

C535 LDA 35H
Preliminary
MC80F0424/0432/0448
;A ←RAM[35H]
983501 INC !0135H
;A ←ROM[135H]
35H
data
~~
0E550H
C5
0E551H
35
➋
~~ _➊ data → A
135H
data
~~
0F100H
98
0F101H
35
0F102H
01
➌
~~ ➋
data+1 → data
➊
address: 0135
8.4.4 Absolute Addressing → !abs
Absolute addressing sets corresponding memory data to Data, i.e.
second byte (Operand I) of command becomes lower level ad-
dress 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
;A ←ROM[0F035H]
0F035H
data
~~
0F100H
07
0F101H
35
0F102H
F0
➋
~~ _{➊ A+data+C → A}
address: 0F035
The operation within data memory (RAM)
ASL, BIT, DEC, INC, LSR, ROL, ROR
Example; Addressing accesses the address 0135_H regardless of
G-flag.
8.4.5 Indexed Addressing
X indexed direct page (no offset) → {X}
In this mode, a address is specified by the X register.
ADC, AND, CMP, EOR, LDA, OR, SBC, STA, XMA
Example; X=15_H, G=1
D4
LDA {X}
;ACC←RAM[X].
115H
data
~~
0E550H
D4
➋
~~
➊
data → A
X indexed direct page, auto increment→ {X}+
In this mode, a address is specified within direct page by the X
register and the content of X is increased by 1.
LDA, STA
Example; G=0, X=35_H
DB
LDA {X}+
MAR. 2005 Ver 0.2
37