12Fxxx & Vref Input
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
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