Olin Lathrop wrote:

>Paul van der Linden wrote:
>  
>
>>If I use HVP, if I set the LVP-configuration bit at 0, I can just use
>>the pins PGM, PGC and PGD for digital I/O?
>>
>>If I use LVP, so the LVP-configuration bit is at 1, I can use the
>>pins PGM, PGC and PGD for digital I/O as long as PGM isn't high at
>>boot?
>>    
>>
>
>I don't remember which way 0 or 1 is for the LVP configuration bit.  If LVP
>is disabled, then the PGM pin is a normal I/O pin at all times.  When LVP is
>enabled, then the PGM pin is always used for the PGM function.  The PGC and
>PGD pins are always used during external programming (whether LVP or HVP) to
>transfer the data.  Once the PIC is running they are normal I/O pins.
>However, you need to make sure that the external circuit can tolerate them
>being wiggled by the programmer.
>
>
>*****************************************************************
>Embed Inc, embedded system specialists in Littleton Massachusetts
>(978) 742-9014, http://www.embedinc.com
>  
>
Ok, thank you. But how to make sure that the external circuit can 
tolerate it? How do I seperate it while programming?

And repost for the people who don't get the attachments:
http://members.lycos.nl/pvdl1984/micro.html
For the first circuit:
If I understand the datasheets I can use the scheme as application 
circuit with fullspeed USB connection and eventually adding some things 
like LED, buttons, enz?
And for the second circuit:
As far as I understand I can use the scheme for LVP programming of the 
18F2455/2550/4455/4550 serie (as described in 
http://home.t-online.de/home/520054661375/stolz.de.be/lvpc/index.html )?

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist