Changing CONFIGURATION word from within program

[Melanie]

Sorry to tell you, but the Config word is not accessible through your program in any way.

The only way is to solder-on leads for ICSP but bear in mind that a high voltage is applied to MCLR (easy if you have tied this to Vdd with a Resistor, just unsolder it), and that RB6/RB7 carries the programming data and clock so it shouldn't be loaded down with too much baggage. PIC will have +5v on it... so again, best to isolate it rather than power up your entire PCB. http://www.picbasic.co.uk/forum/atta...8&d=1088530104

Other than that, it's time to make friends with your favourite desoldering tool...

[btaylor]

I ended up making up a programming harness than linked the target board to my EPIC programmer. Similar to your schematic except I found I had to groundthe LV Prog pin of the PIC16LF877A TQFN package. Only a couple of fixable shorts soldering to the fine pitch wires and all 20 boards recovered in the end.

By enabling the WDT I was able to use the PBP SLEEP command and drop the idle current draw from 120 uA down to 8 uA (including two 32 Mbit serial flash memories).