Help with code, button

[xobx]

I dont know its a PIC16F648A

[mackrackit]

According to the data sheet it has two comparators.
The above links will explain why
CMCON=7
is needed.

[xobx]

Ok, thanks.

But it still dosent work as I want it :/

@   device  pic16F648A, hs_osc, wdt_off, mclr_on, lvp_off, protect_off
DEFINE OSC 20

LED1 var PORTB.1
PRESS var PORTA.1
CMCON=7


loop:

If press=1 then       
            high led1  
            else
            low led1  
            endif      
            goto loop   
            end

When i transfer it LED1 starts to shine directly even if PortA.1 doesnt have +5V

:/

[mackrackit]

Maybe the LED is backwards

Do you have PORTA.1 tied to ground with a resistor (10K) so it is not floating?

[xobx]

Floating ?

[xobx]

Should it be like this?

[mackrackit]

Yes, that is correct.