Figure 41. Rtc Alarm Causes The Mcu To Exit The Stop Mode; Figure 42. Setting The Wakeup Time; Figure 43. Rtc Alarm Wakeup Configured - STMicroelectronics STM32100B-EVAL User Manual

Running the demonstration
Note: If an RTC Alarm is generated while the MCU is in Stop mode and the message shown in
Figure 40
the Stop mode), the RTC Alarm causes the MCU to exit Stop mode. The message shown in
Figure 41

Figure 41. RTC Alarm causes the MCU to exit the Stop mode

●
In the second case, the RTC Alarm wakes up the MCU from Stop mode after the
programmed time has elapsed. When selecting this submenu, you have to set the
alarm to the time when the MCU is to exit Stop mode. To set the wakeup time, follow
the procedure explained in section

Figure 42. Setting the wakeup time

Once the alarm has been configured, the red LEDs stop blinking and the system enters
Stop mode. The message shown in

Figure 43. RTC Alarm wakeup configured

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is displayed (which means that the Key push-button needs to be pressed to exit
is then displayed.
Wakeup by RTC Alarm
Press joystick to
continue...
MCU in Stop Mode
Wait For RTC Alarm
Doc ID 16982 Rev 1
Stop Mode
Time submenu.
HH:MM:SS
Figure 43 is displayed on the LCD.
UM0891