We work with Blackfin BF537. We used the RTC with a extern Batterie for the RTC. The system ist powered at power line, but not 24h per day..
For a long batterie life, we have 2 diodes, for the RTC Vdd. If the system is power on, the RTC will power from the normaly power, and the batteri have no function.
I search for a posibility, to detect, if the batterie is low. I dont found a flag or bit, for detect this situation.
can everybody give me a idea ??