I need to add stand alone feature to an old logger design using TM4C1294, it needs to keep the RTC running when main power is off, when the main power is back on, it reads the RTC and continue with the task interrupted before the power was removed
Are the following addition enough for the hardware? I just need to add enough so that I can order a prototype to work on the codes
- Add a 3V cell battery to VBAT pin of TM4C1294
- Populate the 32.768K crystal and caps for XOSC0 and XOSC1
What do I do with WAVE pin? Connecting to ground only when external power is detected, otherwise connect it to 3V cell battery?
Thanks!