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. The internal low-speed RC has a typical frequency of 32 kHz. 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. Our portfolio includes tuning fork watch crystals, quartz crystals, oscillators, VCXOs, TCXOs, OCXOs, real time clocks (RTC), and miniature shielded power. mode Real-time clock RTC runs, preserving RAM contents Run without real time. The RTC provides a programmable alarm and programmable periodic interrupts with wakeup from Stop and Standby modes. Characteristics 32 kHz operating frequency A timer works The operation mode. The STM32 RTC example program shows how to configure and use the realtime clock of STMicroelectronics STM32F103xx microcontroller. 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. 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. 20 backup registers The real-time clock (RTC) is an independent BCD timer/counter. We came up with the product USB RTC for Raspberry Pi, Windows, LINUX, MACOS, STM32, etc and with the help of our design partner SB Components, USB RTC.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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