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Hello everybody i am new on this forum and checked also topic related with comparator and didnt find any solution's so here i am posting my code ..please have a look and give me suggestion ...to work my comparator of 16F684............. Rc0--analog input Rc1--internal ref voltage Rc4--comparator output. using intenal comparator at 8mhz .. not using any interrupt..of ocmparator MAIN CODE start ;***********************define pin direction, and initialization ************************* clrf PORTA clrf PORTC movlw 0x02 movwf PORTA ;;RA1 as supply power which is supply voltage for melexis clrf ANSEL movlw 0x05 ;enable comparator(one independent comparator enabled) movwf CMCON0 bsf STATUS, RP0 ;change bank0 to bank1 bcf TRISC,RC3 ;set RC3 as output--WAKE-UP bcf TRISC,RC4 ;set RC4 as output--comparator output bcf TRISA,RA1 ;set RA1 as output--Power Supply to Switch bsf TRISC,RC0 ;set RC0 as input---Switch analog output bsf ANSEL, RC0 ;set RC0 as analog input movlw 0x71 ;8Mhz movwf OSCCON ;1-HTS stable bit and 1-internal clock movlw 0x0F ;x0F ---max frequency movwf OSCTUNE ;to select the max frequency tunning bit register bcf STATUS, RP0 clrf INTCON ;************************************************* **************************************** comparator: bsf STATUS, RP0 movlw 0x86 ;internal voltage reference movwf VRCON ;internal voltage reference set to(x86) 2,1875 volts bcf STATUS, RP0 ;Cvref=((Vdd\4)+((Vrr[3:0]*Vdd)\32)) Check_comp: btfsc CMCON0, C2OUT ;when the internal ext vtg is greater than 2,1875 v ;btfsc PORTC,RC4 goto WU_OFF ;than only we will get output from op-amp. goto WU_ON WU_ON: bsf PORTC,RC3 goto Check_comp WU_OFF: bcf PORTC,RC3 goto Check_comp please reply me as soon as possible.....request!!!!!!!!!!!!!! | |
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