The standard time of WDT TIMEOUT is 18mSec,
but it is very important that
the minimum value of WDT TIMEOUT is 7~9mSec,
and it will be affected by temperature.
This value is not a test value, but a calculated value, so please do not trust it too much.
If you use WDT, it is recommended to clear WDT within 5mSec.
Note that the chip's LVP (low voltage programming enable) must be disabled. If you really need it to be turned on, make sure your hardware has grounded PGM/RB3.
If your power supply voltage is low, do not turn on BOD (low voltage reset)
The DEBUG (debug mode) in the configuration bit must also be disabled
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