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Thanks, for the info. I'm finishing the code and in a bit of rush now, so I will test this on weekend, just to get some personal knowledge.

I don't think that a hardware reset is being happening, the supply has 3A limit so, no brownout, the MCLR is with a pull up resistor and is handled only by the ICD3, there's no pin or external device ...

Lithium batteries doesn't have a bigger self discharge index?

I'm setting T1 this

set_timer1(0xFFFF-(31000/4));

This setting is giving me 1.08s base time. Doing some math give ...

No, in this case I don't.

#FUSES PROTECT,NOWDT,INTRC_IO,NOBROWNOUT,NOLVP,NOFCMEN,NOMCLR,NOPUT,BORV19,NOIESO,WRT//,PLL_SW

I know that everything freeze on halt but Why the interrupt registers are not restored when I hit run again? Instead the program "continues" from PC 0x0000 not from the next instruction.

I didn't compared but I searched if some instruction in the disassembling list were changing something in the INTCON or PIE registers and they don't.

If I leave the circuit without a breakpoint or ...

I'm trying to blink a LED with TMR1 interrupt but the interrupts are being disabled when I stop the program in debug mode. I'm seeing this on the Watch window.

When I hit the run button the program ...

random thoughts....

hmm, remember the internal RC OSC isn't 'great' at accurate timing and varies on temperature.

Only sending once every 12 hrs is 'scary' to me. My luck it'd fail 12.3 seconds ...

Nope. Is an RF PIR, so is interrupted every time a person walk in front of it.
I need to send a test signal to the alarm panel every 12 hours to know that the device is there.

I can't add any exte ...

Cool, nice approach, I wasn't thinking in to use a second timer on HiSpeed mode. I was thinking in a way to read the WDT that always run with the same clock but yours is better.

I will try your app ...

I have a PIC16LF1827 and, since is a low power battery device, I change the device speed from 31kHz to 4MHz when needed but I need a time base and since all the timers must run from the internal oscil ...

I've just found how to make it work.

#fuses NODEBUG
#use delay(internal=32MHz,USB_FULL,ACT)
#fuses SOSC_LOW,SOSC_SEL,PROTECT_CFG,PROTECT

I wish to use MPLAB IDE 8.92 but this microcontroller is not supported in MPLAB IDE.

I think that the problem is something in debug mode but the HEX is created in D:\MyProject.X\dist\ICD3_profile\p ...

I'm trying to compile the HEX for production but the CSS bit is not being set on MPLAB X IDE v6.20

I'm compiling with Shift+F11(Clean and compile)

#use delay(internal=32MHz,USB_FULL,ACT ...

Thanks for your ideas, now the code is running fine.

Now I'm fighting against a nasty bug that is making the PC jumps from one routine to another that shouldn't. Later I will create a new post expl ...