MC81F4204
April 24, 2012 Ver.1.41 59
Example : Addressing accesses the address 0135
H regardless of G-flag.
:;WhenG=0
INC!0135h;increaseROM[135h]
:;opcodeis98h
:
Indexed Addressing
X indexed direct page (no offset) → {X}
In this mode, an address is specified by the X register.
ADC, AND, CMP, EOR, LDA, OR, SBC, STA, XMA
Example :
:;WhenG=1,X=15h
LDA{X};A=ROM[(RPR<<8)+X]
:;opcodeis0D4h
:
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
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