HAL RTC How to Use ¶

group RTC_How_To_Use

The Real-Time Clock (RTC) is an independent BCD/Binary timer/counter.

The RTC provides:

• Time-of-day clock/calendar

• Programmable alarms

• Timestamp feature

• Automatic wake-up timer

The RTC clock called RTCCLK can come from different sources:

• HSE

• LSE

• LSI

By default the RTC prescalers are configured to work with the LSE clock at 32.768 kHz.

RTC and microcontroller low power modes ¶

The MCU can be woken up from low power mode by RTC functions.

The RTC functions are the :

• Alarm A event.

• Alarm B event.

• Timestamp event.

• Wake-up timer event.