>
>On Sat, Jun 12, 2004 at 05:21:57PM +0200, Wouter van Ooijen wrote:
>> > Wouter, I need some separation clarity from you here.
>> >
>> > I'm clear on the LVP pin problem when programming. See my other
>> > post. But are you saying that there's a glitch issue when simply
>> > using a HVP programmed
>> > part with LVP config bit clear?
>>
>> Not when just running.
>
>OK. Clear. Sounds like another point for a bootloader. And I
>now really agree with the point you have in the ZPL
>documentation about not messing with the 18F config bits even
>though they are writable.
>
>>
>> But for the argument 'but I use a HVP programmer and my image has LVP
>> disabled': note that when you reprogram the part you will
>likely erase
>> it as part of the programming process. And the erased state
>of the LVP
>> bit is?


>-----Original Message-----
>From: Byron A Jeff [mailto:byron@CC.GATECH.EDU]
>Sent: 15 June 2004 15:02
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC] PIC18F452 LVP pin needs to be tied low?>
>
>LVP on! As I said above I'm clear on the LVP pin problem when
>programming. So the new wrinkle is ICSP. Even when doing HVP
>only via ICSP one must make sure that the LVP pin doesn't float.
>
>Crystal clear now.

Better muddy up the waters then!  The LVP "problem" is only a problem when
programming the PIC above 4.5 volts.  If a PIC is being used in a 3.3volt
application, it's only an issue the first time the device is programmed. (no
bulk erase below 4.5 volts).

Regards

Mike




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