Turn ON RA4 Permanently

[Suraj143]

Hi i need to turn on RA4 permanently & use the first nibble of PORTA for other work.But RA4 never turns on, I used a pull up resistor also.

	bsf	PORTA,4
	movf	Data,W
	andlw	b'00001111'
	movwf	PORTA

 

[Mike - K8LH]

Did you turn comparator off?

 

[Suraj143]

Did you turn comparator off?

Oh yes

movlw	0x07
movwf	CMCON

 

[Mike - K8LH]

Usual suspects are; (1) MCLR not pulled up to VCC... (2) Missing bypass capacitor on VDD and VSS pins... (3) LVP enabled and PGM pin floating... (4) Trying to use a crystal oscillator on a solderless breadboard...

 

[Suraj143]

Ok Mike I'll try to change your settings & see.

Thanks

 

[bananasiong]

Hi,

andlw  b'000[COLOR=Red][B]0[/B][/COLOR]1111'
movwf PORTA

Anything ANDed with 0 is 0.