Many a times, I have used an I/O pin to drive a relay through a transistor. So, assuming I need an active high output to turn on the relay, I have observed (across microcontroller families) that the...
As others have said, after power on and reset (POR) all the pins come up as inputs so they should not go either high or low for any duration. Leakage current into...
its not quite that simple, contemporary chips like 18f27q43 have a pwm module that can use alternative clock sources like the mfosc @[500k] and its that allows 50hz operation, some others have...
if you have leds that illuminate on power up before the pins have been set as outputs then you are doing something very odd
or you have broken something
Here is an example of a neat little solar panel tracker that I built for a NiMh battery charger. I decided to build it for a variety of reasons - - -
...
Menu
Re: I/O Pin status during startup
I Never saw something like that ....
Acetronics2 Today, 08:27but, if we consider LEDs as current generators when illuminated ;) ( Yes, the built in input clamp diodes ... )
the question comes ... is the pic in a true...