The source code needs to be amended to use interrupts. Please do in the Assembly language, the PIC16F886 devboard is used. The source code is attached below.

#include #define SW2 PORTB, 5 __CONFIG _CONFIG1, _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT __CONFIG _CONFIG2, _WRT_OFF & _BOR21V cblock 0x70 D1 D2 endc ORG 0 ;call Init_D3 start: banksel ANSELH ; CLRF ANSELH; MOVLW B'00000000' ; MOVWF ANSELH; banksel PORTB CLRF PORTB banksel TRISB MOVLW B'11110000' ; MOVWF TRISB

; banksel INTCON ; CLRF INTCON ; bsf INTCON, 7 ; bsf INTCON, 4 ; bcf INTCON, 1

LED4OnLoop: banksel PORTB call Delay_1s call Delay_1s call Delay_1s bsf PORTB, 3 bcf PORTB, 0 bcf PORTB, 1 bcf PORTB, 2 banksel PORTB btfsc SW2 goto LED4OnLoop call Delay_1s goto IntLoop IntLoop: banksel PORTB btfsc SW2 goto IntLoop bcf PORTB, 3 call Delay_1s bsf PORTB, 0 call Delay_1s bcf PORTB,0 call Delay_1s bsf PORTB, 1 call Delay_1s bcf PORTB,1 call Delay_1s bsf PORTB, 2 call Delay_1s bcf PORTB, 2 call Delay_1s bsf PORTB, 3 call Delay_1s bcf PORTB,3 goto LED4OnLoop Delay_1s: nop decfsz D1,f goto Delay_1s nop decfsz D2,f goto Delay_1s return end ;

Pre-lab Preparation (a) Connect the 28-Pin LIN Demo Board to your computer. (b) Write the code in ASSEMBLY language and program your development board to perform the following functions: (1) The on-board LED DS4 will be initially off (2) After a short period of time, LED DS4 will come on and stay on for the duration of operation (3) Utilizing the SW2 push-button, the one on Bank B, trigger an interrupt which causes functionality of the LEDS to change. - First: DS4 LED should turn off - Second: DS1 LED should blink once - Third: DS2 LED should blink once - Fourth: DS3 LED should blink once - Fifth: DS4 LED should blink once (4) Upon resuming normal operation, the DS4 LED should still be on and stat that way for the duration of operation