help using the comparators

[TronicBrain]

I am tring to get some familiraity with comparators and tring some small projects.
and my problem that I can not bcf the CMIF, it still set after that Vin+>VIN-,
and I can clear it when back to Vin+<VIN-
I made this code to see what is happening to the CMIF
P=16F630

ORG     0x000             ; processor reset vector
		goto    main              ; go to beginning of program

main		bsf     STATUS,RP0        ; set file register bank to 1 
		MOVLW	B'10001111'
		MOVWF	VRCON
		MOVLW	B'000011'
		MOVWF	TRISA
		CLRF	TRISC
		BSF	PIE1,3
		CLRF	EEADR
		bcf     STATUS,RP0        ; set file register bank to 0
		MOVLW	B'00000011'
		MOVWF	CMCON
		CLRF	INTCON
		CLRF	PORTC
		CLRF	PIR1

CHECK

BTFSS	PIR1,CMIF ; set When VIN+>Vin-
GOTO	ZERO

BSF	PORTC,0 ; LED ON
CALL         DELAY
BCF          PORTC,0
BCF	PIR,CMIF
CALL         DELAY
GOTO	CHECK

ZERO
BCF	PORTC,0
GOTO	CHECK 
end

The LED still blinking after Vin+>Vin- that means the CMIF is not clrear.
Would you please hlep me to find my mistake because I'm really confused.