PortA , PortB

[DiGGi]

Hello,
I have a problem. I'm using PIC16F627A and PicBasic-Compiler (NOT PRO!!).
If I use e.g. the commands 'PINx' , 'Button' or 'High/Low' they all work only on PortB. Is there a possibility that they work on PortA ??

Dirk

[BobK]

Hi DiGG,

Did you remember to disable the analog and comparator features on PortA?

BobK

[DiGGi]

How can i disable them?

[BobK]

Hi DiGGi,

It usually depends on what's in the data sheet for the particular PIC you are using. These are something like: ADCON1 = 7 to disable the analog inputs and make the pins digital and CMCON = 7 to disable the comparators. There is a section in the PIC datasheet for each of these 2 items. Go to www.microchip.com and in the search field enter the part number you want a manual for. example: PIC16F628. This will give you selections on all the available documents for that part.

ADCON1 and CMCON are then placed in your initialization section of your program.

Please bear in mind that PICs that have analog ports don't necessarily have comparators. This is why you need to have the datasheet handy to refer to.

BobK

[DiGGi]

Hi,
fiorst ThX for your help, but in my data sheet there is no ADCON1 and CMCON.

is there an other solution , for PIC16F627A?

Diggi

[mister_e]

Ok i do a try, PicBasic is far different from PBP...

try

POKE $1F,7 ' disable comparator

refer to figure 4-2 of the datasheet for the memory map, and section 10 for the comparator module

About 'Pin' Statement... i guess it's valid but i can't confirm how and why... time for me to purchase PBC. I hate to guess..

[paul borgmeier]

...If I use e.g. the commands 'PINx' , 'Button' or 'High/Low' they all work only on PortB. Is there a possibility that they work on PortA ??

No - As I remember, PBC does not have predefined pins or directions for PORTA. You must do them directly (make sure you turn off any analog presets as Bob has noted – this requirement is PIC specific).

For example to make RA0 high,

poke $85, %00000000	' make all PORTA outputs
poke $05, %00000001	' set RA0 high

to turn off RA0 and turn on RA1, you could then do this

poke $05, %00000010

Ask if you need more and good luck