Write a PIC 16F684 microcontroller assembly language program to control the Pres

Question

Write a PIC 16F684 microcontroller assembly language program to control the President’s “nuclear football”. The program must monitor four push-button switches to determine which button is pressed to launch a nuclear missile to one of the four foreign countries. Once the push-button is pressed, turn on the LED for the country selected and launch a missile for that country. You must provide for “switch debouncing” in software.

Please give a written description of how your program operates as well as a diagram and a drawing or picture of what your device looks like. You may select any four foreign countries.

Explanation / Answer

Answer:

;Considering bank1

bank1

;Setting the RA port pins types

mov1w b'11111111'

;RA inputs ports

movwf TRISA

;Setting the RC port pins types

movlw b'11111110'

;including ALL the RC ports which excepts RC0 as output

movwf TRISC

;Go to bank0

bank0

MainLoop

;Reading the RA0 pins

btfss PORTA,RA0

;check the value of RA0 as'0' then move to the Button1_Is_Off

goto Button1IsOff

;sets the off button

Button1_Is_On

;sets the RC0 output

bsf PORTC,RC0

;going back to the main loop

goto MainLoop

;moves to the Button1IsOff

Button1IsOff

;clearing the RC0 output

bcf PORTC,RC0

;back to the mainLoop

goto MainLoop

;going back to bank1

;Considering bank1

bank1

;Setting the RA port pins types

mov1w b'11111111'

;RA inputs ports

movwf TRISA

;Setting the RC port pins types

movlw b'11111110'

;including ALL the RC ports which excepts RC1 as output

movwf TRISC

;Go to bank0

bank0

MainLoop

;Reading the RA1 pins

btfss PORTA,RA1

;check the value of RA1 as'0' then move to the Button2_Is_Off

goto Button2IsOff

;sets the off button

Button2_Is_On

;sets the RC1 output

bsf PORTC,RC1

;going back to the main loop

goto MainLoop

;moves to the Button2IsOff

Button2IsOff

;clearing the RC1 output

bcf PORTC,RC1

;back to the mainLoop

goto MainLoop

;going back to bank1

;Considering bank1

bank1

;Setting the RA port pins types

mov1w b'11111111'

;RA inputs ports

movwf TRISA

;Setting the RC port pins types

movlw b'11111110'

;including ALL the RC ports which excepts RC2 as output

movwf TRISC

;Go to bank0

bank0

MainLoop

;Reading the RA2 pins

btfss PORTA,RA2

;check the value of RA2 as'0' then move to the Button3_Is_Off

goto Button3IsOff

;sets the off button

Button3_Is_On

;sets the RC2 output

bsf PORTC,RC2

;going back to the main loop

goto MainLoop

;moves to the Button3IsOff

Button3IsOff

;clearing the RC2 output

bcf PORTC,RC2

;back to the mainLoop

goto MainLoop

;going back to bank1

;Considering bank1

bank1

;Setting the RA port pins types

mov1w b'11111111'

;RA inputs ports

movwf TRISA

;Setting the RC port pins types

movlw b'11111110'

;including ALL the RC ports which excepts RC3 as output

movwf TRISC

;Go to bank0

bank0

MainLoop

;Reading the RA3 pins

btfss PORTA,RA3

;check the value of RA3 as'0' then move to the Button4_Is_Off

goto Button4IsOff

;sets the off button

Button4_Is_On

;sets the RC3 output

bsf PORTC,RC3

;going back to the main loop

goto MainLoop

;moves to the Button4IsOff

Button4IsOff

;clearing the RC3 output

bcf PORTC,RC3

;back to the mainLoop

goto MainLoop

;going back to bank1

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