Are both grounds at ground?

You seem to have covered all the obvious things, so it has to be something
that is so obvious you couldn't possibly have missed it!  Makes me wonder if
it isn't worth measuring from pin 12 to pin 1, just to be sure.

72/73 de WB8RCR    http://www.qsl.net/wb8rcr
didileydadidah     QRP-L #1446 Code Warriors #35

----- Original Message -----
From: "Daren X" <>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, January 05, 2004 5:43 PM
Subject: [PIC:] VIHH on MCLR doesnt put PIC in programming mode


> Hi Everyone,
>
> Here is some feedback from the replies I have got so far.
>
> The voltage on the VPP pin was 11.9v, I removed a 100ohm resistor on the
> programmer to increase it to 12.9v, still no difference.
>
> I have grounded the CLKIN pin which stops it from executing code,
> reading from the PIC still doesn't work.
>
> The pic is an 877, not 877A
>
> The programmer works when the PIC is in its own target board, but not in
> my target veroboard.
>
> The PIC is definitely running when MCLR is at 12v as the LCD displays
> the intro message and rs232 communications begin.
>
> I have RB4-7 set as inputs, also have pull-ups enabled on those pins for
> input buttons (which aren't connected at the moment).
>
> I can look into minimising any ringing on the clock and data lines, but
> I don't think there is a point until I can get this MCLR problem sorted.
>
> Regards,
> Daren
>
>
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