Internal pull-up may sucks, check OPTION reg in the datasheet and see what happen when you set a pin to output... probably the internal pull-up get disabled 'till you set them again... use external one and post your results.
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Re: Quick 4x4 keypad matrix question
Internal pull-up may sucks, check OPTION reg in the datasheet and see what happen when you set a pin to output... probably the internal pull-up get disabled 'till you set them again... use external one and post your results.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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