Question

In: Electrical Engineering

question#1: Write instructions to toggle bits Bit0 of PORTB assuming the PORTB is already initialized as...

question#1: Write instructions to toggle bits Bit0 of PORTB assuming the PORTB is already initialized as an output port.

question#2: The following unsigned integer readings are stored in data register starting from REG10 (address 10H). Data (H): 40, 45, 4A, 32, 52, 38, 3A, 44 Write a program that finds the average temperature. Simulate your program in PIC18 IDE Simulator and attach a screenshot of your simulation while the program is running.

Expert Solution

STATUS equ 03h ;Address of the STATUS register

TRISB equ 86h ;Address of the tristate register for port B

PORTB equ 06h ;Address of Port B

COUNT1 equ 08h ;First counter for our delay loops

COUNT2 equ 09h ;Second counter for our delay loops

;****Set up the port****
bsf STATUS,5 ;Switch to Bank 1

movlw 00h ;Set the Port A pins

movwf TRISB ;to output.

bcf STATUS,5 ;Switch back to Bank 0

;****Turn the LED on****
Start movlw 01h ;Turn the LED on by first putting

movwf PORTB ;it into the w register and then on the port

;****Start of the delay loop 1****
Loop1 decfsz COUNT1,1 ;Subtract 1 from 255

goto Loop1 ;If COUNT is zero, carry on.

decfsz COUNT2,1 ;Subtract 1 from 255

goto Loop1 ;Go back to the start of our loop.

;This delay counts down from 255 to zero, 255 times

;****Delay finished, now turn the LED off****

movlw 00h ;Turn the LED off by first putting

movwf PORTB ;it into the w register and then on the port

;****Add another delay****
Loop2

decfsz COUNT1,1 ;This second loop keeps the

goto Loop2 ;LED turned off long enough for

decfsz COUNT2,1 ;us to see it turned off

goto Loop2 ;

;****Now go back to the start of the program
goto Start ;go back to Start and turn LED on again

;****End of the program****
end ;Needed by some compilers, and also just in case we miss the goto instruction.

Manojponduru answered 3 years ago

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