SOLVED - PIC seems to RESET unless I add a PAUSE in Mainloop

[Demon]

I have no clue.

My PIC is either ON or OFF, I have no Sleep mode.

https://ww1.microchip.com/downloads/...Doc/31026a.pdf

During normal operation, a WDT time-out generates a device RESET. If the device is in SLEEP mode, a WDT time-out causes the device to wake-up and continue with normal operation, this is known as a WDT wake-up. The WDT can be permanently disabled by clearing the WDTE configuration bit.

[Ioannis]

What is the duration of this reset, if it is reset?

You may add a PAUSE 1000 at the beggining of the program and see if this duration is increased. This will confirm that PIC is indeed reseting.

Ioannis

[richard]

It is definitely a reset, a look at the lst file shows that the looped code segment has no pbp statements in it that generate a clwdt instruction

that loop does the the same thing for every pic chip i tried. its not really a practical loop more a curiosity

[Demon]

I was testing a new breadboard layout and PIC config; to make sure I had a heartbeat before piling more code.

[Ioannis]

Since on power up the SEN bit of the WDTCON0 register is at 0 (Watchdog disabled), why does that chip resets itself?

Ioannis

[HenrikOlsson]

Because if the WDTE bits in CONFIG3 is anything but 0b01 the SEN bit is ignored and the CONFIG block of the code contains _WDT_ON which, according to the .INFO file for the device means

 _WDTE_ON	    ;WDT enabled regardless of sleep; SWDTEN ignored

If you want software control of the WDT you could choose

_WDTE_SWDTEN	    ;WDT enabled/disabled by SWDTEN bit in WDTCON0

/Henrik.

[Ioannis]

But then I see no way that PBP is aware of that or can reset the WDT.

Ioannis