Problems concurrently using digital in and digital out on PORTA.

[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.