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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AN3371 Scheda tecnica(PDF) 28 Page - STMicroelectronics |
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AN3371 Scheda tecnica(HTML) 28 Page - STMicroelectronics |
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28 / 45 page  Overview of the STM32 advanced RTC AN3371 28/45 Doc ID 018624 Rev 5 1.11.2 RTC_ALARM output The RTC_ALARM output can be connected to the RTC alarm unit A or B to trigger an external action, or routed to the RTC wakeup unit to wake up an external device. RTC_ALARM output connected to an RTC alarm unit When the calendar reaches the alarm A pre-programmed value in the RTC_ALRMAR register (TC_ALRMBR register for alarm B), the alarm flag ALRAF bit (ALRBF bit), in RTC_ISR register, is set to ‘1’. If the alarm A or alarm B flag is routed to the RTC_ALARM output (RTC_CR_OSEL[1:0] =”01” for alarm A, and RTC_CR_OSEL[1:0] =”10” for alarm B), this pin is set to VDD or to GND, depending on the polarity selected. The output toggles when the selected alarm flag is cleared. Figure 19. Alarm flag routed to RTC_ALARM output RTC_ALARM output connected to the wakeup unit When the wakeup downcounting timer reaches 0, the wakeup flag is set to ‘1’. If this flag is selected as the source for the RTC_ALARM output (OSEL[1:0] bits set to ‘11’ in RTC_CR register), the output will be set depending on the polarity selected and will remain set as long as the flag is not cleared. MS19535V1 Alarm B ss, mm, HH/date Alarm A ss, mm, HH/date hh:mm:ss (12/24 format) Day/date/ month/year Calendar = = Alarm A flag Alarm B flag RTC_ALARM output OSEL[1:0] |
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