Hi,
Just want to check my understanding. I am putting together a low power battery powered project and want to wake the ATmega from sleep when an interrupt goes low. So there will be a pull up resistor to hold the pin high and it will be pulled low by a reed switch.
Am I correct in thinking that the current draw through the ATmega is very low on a pin that is held high and that the pull-up resistor (commonly 10k) is there to limit the current when the pin is pulled low?
Just want to check my understanding. I am putting together a low power battery powered project and want to wake the ATmega from sleep when an interrupt goes low. So there will be a pull up resistor to hold the pin high and it will be pulled low by a reed switch.
Am I correct in thinking that the current draw through the ATmega is very low on a pin that is held high and that the pull-up resistor (commonly 10k) is there to limit the current when the pin is pulled low?