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This article explains how to use the RTC. It provides code examples to use RTC Alarm with interrupt.
1. RTC definition
A real-time clock (RTC) is an independent binary-coded decimal (BCD) timer/counter. For that, the RTC provides a time-of-day clock/calendar with programmable alarm interrupt. Also, the RTC can provide an automatic wakeup to manage all low-power modes. The STM32L476 integrated RTC peripheral can be used for different main features are the following:
- Calendar with subseconds, seconds, minutes, hours, day, date of day in month, month and year.
- Daylight saving compensation programmable by software.
- Programmable alarm with interrupt function.
- Automatic wakeup unit generating a periodic flag that triggers an automatic wakeup interrupt.
- Reference clock detection: a more precise second source clock (50 or 60 Hz) can be used to enhance the calendar precision.
- Accurate synchronization with an external clock using the subsecond shift feature.
- Digital calibration circuit (periodic counter correction).
- Time-stamp function for event saving.
- Tamper detection event with configurable filter and internal pull-up.
- 32 backup registers.
- Maskable interrupts/events:
- Alarm A
- Alarm B
- Wakeup interrupt
- Time-stamp
- Tamper detection
1.1. Objective
1.2. How
1.3. Create the project in STM32CubeMX
[[category:Getting_started_with_STM32_system_peripherals | 15]]