PIC10F200 WDT disable during runtime

edi · Joined: 22 Dec 2003 Posts: 82

I use the WDT during the program run.
In some cases I want to put the 10F200 into a sleep for a very long time without wakeup on WDT but only by GPIO change.
Is there a way to disable the WDT during program run, after it was enabled?

Ttelmah · Joined: 11 Mar 2010 Posts: 19538

No.
This is a 'read the data sheet' one.
On these chips, the watchdog is only disabled/enabled by a fuse. A lot of the larger chips offer a 'soiftware' option to allow the watchdog to be disabled in code, but not this one.
However it is very easy to test using restart_cause, and if this is from a watchdog restart, just go to sleep again. The CPU need only wake for a handful of instructions every (approx) 2.3 seconds, and the power consumption of this is tiny. Got units waking like this that have been running for years on a single small lithium battery....

Best Wishes

edi · Joined: 22 Dec 2003 Posts: 82

I understand it from the data sheet.
But as you mention I looked for a trick to overcome it.

Thanks a lot.