• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

comparator not working

Status
Not open for further replies.

Robinwithu

New Member
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!!!!!!!!!!!!!!
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top