Kenji Arai / Mbed 2 deprecated Nucleo_RTC_Clock_setting

Check RTC LSE(External Xtal, 32.768kHz) mode

Dependencies:   mbed CheckRTC

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Please refer follow links.
My notebook
http://developer.mbed.org/users/kenjiArai/notebook/nucleo-series-clock-structure-and-xtal-oscillation/
Q&A for RTC Xtal
http://developer.mbed.org/questions/4531/RTC-External-Crystal-Nucleo/

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