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NanoPi NEO How to work with the built-in real-time clock RTC

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How to work with the built-in real-time clock RTC
PCB v.1.4 have pin CVBS and GND for connect external battery- this pin have 50 Ohm input impedance
How connect battery, can who knows???
CVBS (Composite Video Baseband Signal) is a connection for CVBS/FBAS Video Output and not for a clock-battery:

https://en.wikipedia.org/wiki/Composite_video

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