18F66J94 power-up problem

[spilz]

Re: PIC18F67J94 power on problem:
http://www.ccsinfo.com/forum/viewtopic.php?t=53706

Hello

Did you find a solution for this ?
I have a similar issue with PIC18F66J94 which randomly don’t start correctly on power on. I need to physically set MCLR to ground to restart the PIC and it works fine after that. But it’s not acceptable for a device that should turn on when I connect the battery :(

@Ttelmah : is there a fuse or a delay parameter I have to change before using what you suggest about setup_act ?

Thanks for your help.

For information I’m using external quartz at 16MHz, not the internal one

[Ttelmah]

Er. If you are using an external quartz, you should not be using ACT.
ACT is to tune the internal clock so that it is synchronised to an external
source.
You have to disable ACT in the clock setup to use what I suggested, but
in your case, you can not/should not be using that anyway.

In your case, how is the unit powered?. There is an issue if the supply
rail rises slowly, that the internal PIC reset cannot then cope. There is
a specification for the maximum rise time for the supply, and if this is
not met, the only solution is an external MCLR circuit.