That is my experience also; I have hundreds of 'F452 boards in the field,
all with a floating RB5, all programmed fine with a standard Microchip
ICD-2. Mind you, I'll be putting a 10k from RB5 to GND on the next rev of
the pcb...

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Tom
> Sent: 15 June 2004 18:39
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC] PIC18F452 LVP pin needs to be tied low?
>
>
> At 12:01 PM 6/15/04 -0400, you wrote:
> >> >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.
>
> This thread has interested me because I have a board that leaves RB.5
> floating (unconnected). And it has always worked correctly
> with ICSP.  So
> have I just been lucky?
>
> Answer: no. I think! :)
>
> A quick experiment was performed. On my '252 board, I soldered a 2.2K
> resistor from RB.5 to +5 volts.   If a pin floating high is a
> problem, then
> this ought to find it.
>
> Then I erased the part via ICSP using the ICD2.  Blank check
> showed erased
> part.  Then I programmed it.
>
> Result: no problem.  Board works fine.
>
> It is possible that different programmers might work
> differently in this
> regard, I don't know. But for the ICD2, there seems to be no
> problem with
> RB.5 floating high.
>
> Comments invited.
> Tom
>
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