Wouter's email gave me pause for thought. On all of our PIC applications we
have left unused pins to float and normally set to input without any
apparent ill effect. However in the old days of CMOS this was bad news as
the high impedance could lead to oscillating inputs and high current drain. 

Does anyone know if this applies to PIC's or has the input technology long
moved on?

Robin Abbott
Forest Electronics - Home of WIZ-C ANSI C Compiler for PIC's with RAD Front
end
robin.abbott@fored.co.uk
www.fored.co.uk 
 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
wouter van ooijen
Sent: 16 November 2007 22:39
To: 'Microcontroller discussion list - Public.'
Subject: RE: [PIC] PIC looses it's program memory

> I just checked I have 2 open inputs. How can open input change program 
> memory?

Dunno, but open inputs can be bad: just a little charge can create an
out-of-spec volatage on the pins. And the trouble with out-of-spec is that
it is out-of-spec, that is: behaviour is not guaranteed. 

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl consultancy, development,
PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu
 
 

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