This is a RTC additional function. This is only for Nucleo F401RE & F411RE mbed(Added L152RE, F334R8, L476RG & F746xx). If you connected battery backup circuit for internal RTC, you can make a power-off and reset condition. RTC still has proper time and date.

Dependents:   Nucleo_rtos_sample PB_Emma_Ethernet

Please refer following NOTE information.
/users/kenjiArai/notebook/nucleo-series-rtc-control-under-power-onoff-and-re/

Revision:
5:1a8e7aed053d
Parent:
2:765470eab2a6
Child:
6:ef7d2c83034d
--- a/SetRTC.h	Mon Feb 16 12:43:26 2015 +0000
+++ b/SetRTC.h	Wed Feb 18 09:14:28 2015 +0000
@@ -7,7 +7,7 @@
  *  http://www.page.sannet.ne.jp/kenjia/index.html
  *  http://mbed.org/users/kenjiArai/
  *      Created:  October   24th, 2014
- *      Revised:  Feburary  16th, 2015
+ *      Revised:  Feburary  18th, 2015
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
@@ -82,10 +82,10 @@
   */
 void time_enter_mode(void);
 
-/** Preparation for Deep Sleep (Set I/O port and other peripheral low power condition)
+/** Go to Standbay Mode (Set I/O port and other peripheral low power condition)
   * @param none
   * @return none
   */
-void deepsleep_preparation(void);
+void goto_standby(void);
 
 #endif      // SET_RTC_H