piclist 2002\10\28\180804a >
Thread: 12Fxxx & Vref Input
face BY : ian.forse@spamBeGonelineone.net

The 12F675 has a Vref input option on pin 6 (GP1), however this pin is also
one of the programming pins (ICSPCLK).  I want to use a TL431 as a fixed
voltage reference of 2.5V.  How can I also drive this pin for in-circuit
programming, or is it not possible?
Obviously for a one-off I could disconnect the Vref but this is for
production programming.

Best Regards

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See also: www.piclist.com/techref/microchip/ios.htm?key=input
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Subject (change) 12Fxxx & Vref Input

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