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INCLUDE "p16f877.inc" ;assume this line as adding library of MCU
__CONFIG h'3F31' ;configuration bits are assigned.
sayi1 equ 0x20 ;registers (sayi1, sayi2, sayi3) are defined
sayi2 equ 0x21 ;and their addresses equal to (0x20, 0x21,
sayi3 equ 0xA0 ;0xA0) respectively.
org 0x00 ;this line indicates the starting point ;of the code.
movlw b'00000000' ;number 0x00 is moved into the working register.
movwf STATUS ;content of the working register is transferred into the STATUS register. This way, bank0 is selected.
banksel sayi1 ;bank of sayi1 is selected.
clrf sayi1 ;content of sayi1 is cleared.
clrf sayi2 ;content of sayi2 is cleared.
clrf PORTD ;content of PORTD is cleared.
movlw b'10001000' ;number 0x88 is moved into the working register.
movwf sayi1 ;content of the working register is transferred into the sayi1. contentof sayi1 is 0x88 now.
movlw h'8F'
movwf sayi2 ;content of sayi2 is 0x8F now.
addwf sayi1,W
;sayi1 is added to working register. (h'88'+h'8F') result of the addition is transfered into working register.
banksel sayi3 ;bank of sayi3 is selected.
clrf sayi3
;content of sayi3 is cleared.
movwf sayi3
;content of working register is
transferred
;into sayi3. Sayi3 is equal to result now.
banksel TRISD
clrf TRISD
;content of TRISD is cleared. Pins of PORTD register are selected as output.
banksel sayi3
movf sayi3,W
;content of sayi3 is transferred into working register.
banksel PORTD
clrf PORTD
movwf PORTD ;PORTD is equal to result of the addition.
end ;with this line program ends.
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