William "Chops" Westfield wrote:
> On Feb 13, 2008, at 12:08 PM, Andre Abelian wrote:
>
>   
>> Almost any pin can be made to behave like an open collector by  
>> switching a pin between input and output, but the maximum voltages  
>> are limited by the micros supply rail, unlike a true open collector/ 
>> drain pin.
>>     
>
> I didn't think that "open collector" implied high voltage capability,  
> though I guess I can see how it might be interpreted that way.
>
> Huh.  I never noticed that the PICs RA4 had that sort of capability.   
> Is 8.5V actually USEFUL in that regard?
>
> BillW
>
>   
In the DIY Electronics PIC programmers, Tony Nixon made use of the A4 OC 
to switch the VPP on
and off.on the K182 and K128, using the PIC16F628A (switching 13V).  I 
was uncomfortable with that design,
but it seems to work fine; myself and my clients I own about 100 of them.

--Bob
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