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AN3371 데이터시트(PDF) 28 Page - STMicroelectronics

부품명 AN3371
상세설명  Using the hardware real-time clock
PDF  45 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3371 데이터시트(HTML) 28 Page - STMicroelectronics

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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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