Problems concurrently using digital in and digital out on PORTA.

[Archangel]

Dammit! Gotta get my eyes checked!
Ok, you have a pull up or pull down on PortA.0?
Does the switch seek power or ground when activated ?
Seems like stupid questions, but the problem is nearly always a simple overlooked detail, and hair is too precious to waste on not asking the question.
Ok Ok, I see the val Var is tracking the port status of PortA.0 I would try setting the port status prior to the tris register and triple check for analog stuff still in operation. Does it work if you use High and Low instead of 1 / 0 ? If so that is an indicator of analog stuff still active.

[aratti]

This is your code:

ANSEL = %00000000 ' everything is digital
ADCON0 = 0 ' disable ADC
CMCON0 = 7 ' no comparators

This is what it should be:

Ansel = 0 ' disable analog
CMCON = 7 ' no comparators

Al.

[joseluistajada]

I´m a similar problem.
The outputs in a 16f690 controlled by HIGH command d´ont work fine.

This simpy code present the follw voltages in the pins of 16F690 pic.

inicio:

 
High PORTC.5    
High PORTC.4     
High PORTC.3 

High PORTC.6     
High PORTC.7  
High PORTB.7 

GOTO inicio

VCC Values:

PORTC.5 = 5V
PORTC.4 = 5V
PORTC.3 = 5V

PORTC.6 = 0.6V
PORTC.7 = 1.8V
PORTB.7 = 5V

[BobK]

Hi joseluistajada,

Now add a "pause 500" then make all of your port pins "LO"

All you have done in your simple little program is turn the pins ON.

Put a short delay after your last HIGH command then make all of the pins LO
and you should see your outputs flash on and off at a 1/2 second on and 1/2 second off (assuming a 4mhz crystal).

HTH,

BobK

[falingtrea]

joseluistajada, you also need to show your initialization code. The pins may not be set to digital by default. You need to set TRIS values and ANSEL and other registers before a PIC will work as expected.