![]() To generate a periodic interrupt, a 16-bit programmable binary auto-reload downcounter with programmable resolution is available and allows automatic wakeup and periodic alarms from every 120 μs to every 36 hours. Two alarm registers are used to generate an alarm at a specific time and calendar fields can be independently masked for alarm comparison. The RTC can be calibrated using an external 512 Hz output to compensate for any natural quartz deviation. , Section 55.2.4 you have instructions to use. ![]() In order to initialize the RTC, I followed the instructions given in the UM1725 : Description of STM32F4 HAL and LL drivers. The internal low-speed RC has a typical frequency of 32 kHz. Anyway, my code uses the STM32F469I-DISCO template from CubeF4 that allow to load directly the HAL layer and the system clock (180 MHz via the 8 MHz HSE oscillator). The sub-seconds value is also available in binary format.It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the internal low-power RC oscillator or the high-speed external clock divided by 128. The RTC provides a programmable alarm and programmable periodic interrupts with wakeup from Stop and Standby modes. TIM3 contains many components as shown in the following block diagram. TIM3 is one of many timers embedded in the STM32 Microcontrollers. The RTC features a reference clock detection, a more precise second source clock (50 or 60 Hz) can be used to enhance the calendar precision. We could have used the Systick or the RTC (Real Time Clock), but in this article we will use a simple timer, timer 3 (TIM3), in an STM32G0 Microcontroller. Correction for 28, 29 (leap year), 30, and 31 day of the month are performed automatically. ![]() Dedicated registers contain the second, minute, hour (in 12/24 hour), week day, date, month, year, in BCD (binary-coded decimal) format. mode Real-time clock RTC runs, preserving RAM contents Run without real time. 20 backup registers The real-time clock (RTC) is an independent BCD timer/counter. Characteristics 32 kHz operating frequency A timer works The operation mode.Code: DocID026289 Rev 725/149STM32F411xC STM32F411圎 Functional overview 3.17 Real-time clock (RTC) and backup registers The backup domain includes: ![]()
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