Hi
I have a project using an ATTINY84 where the QFN package is already soldered in place and the pins are effectively inaccessible, barring some heroic soldering. One of the only pins that is accessible is the reset pin, PB3.
I want to use a hall effect sensor to reset and restart the entire device when a magnet is brought near. I had hoped that I could simply connect the output from the sensor to the reset pin to achieve this. However, since the sensor latches low or high, rather than giving a low pulse, I don't think this would work, as the reset pin would be taken permanently low (or high). Non-latching sensors are available but they all seem to draw comparatively high current, and power consumption is a big issue.
So instead I am looking at using a pin change interrupt, generated by the sensor. Since a PCI detects a change, it doesn't matter that it latches. The documentation says that pin change interrupts are available on all pins, so am I right in thinking I can configure the reset pin, PB3, as an interrupt pin?