I've recently started using the real time clock on the TM4C1294. I have the clock working, keeping time, and set with NTP. I want to try and make it a battery backed RTC though.
I'm currently wasting time in an airport, so I can't test. From the schematic, it looks like if I remove R39, and connect a battery to TP11 and gnd - I should be able to keep the clock going while the board is powered down.
Has anyone tried this, or done it with a custom board?
Edit - Oct 10th. Finally got a chance to try it, and it does work! I put 3.3v from the bench power supply on TP11, with