MC81F4204
60 April 24, 2012 Ver.1.41
Example:
:;WhenG=0,X=35h
LDA{X}+;A=ROM[(RPR<<8)+ X]
:;andX=X+1
:;opcodeis0DBh
:
X indexed direct page (8 bit offset) → dp+X
This address value is the second byte (Operand) of command plus the data of X-register. And it
assigns the memory in direct page.
ADC, AND, CMP, EOR, LDA, LDY, OR, SBC, STA,STY, XMA, ASL, DEC, INC, LSR, ROL, ROR
Example :
:;WhenG=0,X=0F5h
LDA45h+X;opcodeis0C6h
:;
:;
:
Y indexed direct page (8 bit offset) → dp+Y
This address value is the second byte (Operand) of command plus the data of Y-register, which
assigns Memory in Direct page.
This is same with above ‘X indexed direct page’. Use Y register instead of X.
Y indexed absolute → !abs+Y
Accessing the value of 16-bit absolute address plus Y-register value. This addressing mode can
specify memory in whole area.
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