Check RTC LSE(External Xtal, 32.768kHz) mode
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/
Diff: mbed.bld
- Revision:
- 4:56a0cbad89b0
- Parent:
- 2:8b6a8cfa173a
diff -r 921a09e41147 -r 56a0cbad89b0 mbed.bld --- a/mbed.bld Sat Nov 01 01:48:56 2014 +0000 +++ b/mbed.bld Sat May 16 23:38:13 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89 \ No newline at end of file +http://mbed.org/users/mbed_official/code/mbed/builds/dbbf35b96557 \ No newline at end of file