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MC81F4204 Datasheet(PDF) 56 Page - Finechips

Part # MC81F4204
Description  ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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Manufacturer  FINECHIPS [Finechips]
Direct Link  http://www.finechips.com
Logo FINECHIPS - Finechips

MC81F4204 Datasheet(HTML) 56 Page - Finechips

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MC81F4204
56
October 19, 2009 Ver.1.35
Direct Page Addressing -> dp
In this mode, an address is specified within direct page. Current accessed page is selected by
RPR(RAM Page select Register). And dp( Direct Page ) is an one byte data which indicates the target
address in the current accessed page.
Example :
:
;When G = 0
LDA 35h
;A = [35h]
:
;op code is 0C5h
:
Absolute Addressing
Absolute addressing sets corresponding memory data to Data, i.e. second byte (Operand I) of
command becomes lower level address 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
The operation within data memory (RAM) : ASL, BIT, DEC, INC, LSR, ROL, ROR
Example :
:
;When G = 0
ADC !0F035h ;A = A + C + ROM[0F035h]
:
;op code is 07h
:
Example : Addressing accesses the address 0135H regardless of G-flag.


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