This should be a fundamental question for you PIC experts.
I would like to use PIC inputs with a switch without requiring a resistor. If I make the inputs high when the switch is pressed then I need an external pull down resistor to keep the inputs from floating. So I thought I could instead pull the inputs low when the switch is pressed and use the internal pull up. However I'm afraid I've already damaged a couple PICs in this way.
Can an input be taken low safely without a resistor? It seems that could be problematic, because when the PIC first starts up if the output is high then it will exceed 25 mA.
Thanks!
Dan East
I would like to use PIC inputs with a switch without requiring a resistor. If I make the inputs high when the switch is pressed then I need an external pull down resistor to keep the inputs from floating. So I thought I could instead pull the inputs low when the switch is pressed and use the internal pull up. However I'm afraid I've already damaged a couple PICs in this way.
Can an input be taken low safely without a resistor? It seems that could be problematic, because when the PIC first starts up if the output is high then it will exceed 25 mA.
Thanks!
Dan East