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for what its worth
porta.4 also fails to operate as a normal gpio i/p when hpm is used
DEFINE CCP5_REG 0
DEFINE CCP5_BIT 0

is needed to restore operation


edit, ...

did i say ioc pin change is a bad way to do keys

try this and compare results



#CONFIG __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
...

the power on default state for RxyPPS regs is 0 ie pin is assigned to be gpio
so
RB0PPS = 0 assigned to pin RB0 TO be a gpio pin [which it already was ]


none of this serves any worthwhile...

you need to read and adhere to the PBP3_PPS_notes.txt file in your pbp3 directory





Oooops, added edit to your post by mistake.... (- Demon)