MC81F4204
April 24, 2012 Ver.1.41 57
9.7 Addressing modes
The MC81Fxxxx series MCU uses six addressing modes;
- Register Addressing
- Immediate Addressing
- Direct Page Addressing
- Absolute Addressing
- Indexed Addressing
- Indirect Addressing
Register Addressing
Register addressing means to access to the data of the A, X, Y, C and PSW registers. For Example
‘ASL ( Arithmetic Shift Left )’ only accesses the A register.
Immediate Addressing
In this mode, second byte (operand) is accessed as a data immediately.
Example :
:
ADC#35h;opcodeis04h
:
:
When G-flag is 1, then RAM address is defined by 16-bit address which is composed of 8-bit RAM
paging register (RPR) and 8-bit immediate data.
Example :
:;WhenG=1,RPR=1
LDM#35h,#55h;opcodeis0E4h
:
:
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