You need to follow the instructions in the datasheet. You can do exactly 
what you mentioned, and more.

--Bob

john wrote:
> How do you  set cmcon if you still want to use one (or 2) of the analog 
> comparators, but require the rest digital, or is there another way to 
> set this?
>
> Regards
>
> John
>
> Bob Axtell wrote:
>
>   
>> Renzo wrote:
>>  
>>
>>     
>>> I have a circuit, mainly a counter, with Led display driven by a 
>>> 16F84a that runs perfectly.
>>> I changed the chip with a 16F628A , no change in the circuit I only 
>>> replaced in the program the RAM beginning with 20h instead of 0Ch and 
>>> of course processor and include file..
>>> Now to start I have to momentary ground Rb0 and Rb4 never change.
>>>
>>> There are any other replacement to do? There is some article that 
>>> deal with this problem?
>>> Thanks
>>> Renzo Giurini
>>>
>>>  
>>>    
>>>
>>>       
>> There are a few other changes, too. Look at the Microchip Spec sheet for 
>> the PIC16F628A.
>> At the very least, CMCON will have to be loaded with 7 to turn off the 
>> analog comparators,
>> and enable digital signal operation.
>>
>> --Bob
>>  
>>
>>     
>
>   

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