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AN3133 Fiches technique(PDF) 30 Page - STMicroelectronics

No de pièce AN3133
Description  A real-time clock is a computer clock that keeps track of the current time
PDF  43 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3133 Fiches technique(HTML) 30 Page - STMicroelectronics

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Application examples
AN3133
30/43
Doc ID 16956 Rev 5
Figure 14.
Calendar example: main program flowchart
1.
These steps are added to have a secure display on the LCD (which uses SPI connections).
Figure 15.
Calendar example: RTC alarm ISR flowchart
Disable interrupts(1)
Enable Interrupts(1)
Enab le RTC clock ( = L SE)
Init the Calendar and the
alarm and enable the Alarm
interrupt
Display Time and Date on
the LCD
START Main Program
Init the LCD and clear it
Config IOs for Leds, Key and
Joystick Buttons and
Enable 3 EXTI Interrupts
(Key, Left_Joy, Right_Joy)
Alarm _Occurred
False
Display Time, Alarm message
on the LCD and Toggle Leds
True
Alarm Occu rr ed = F alse
ai17270
Clear Alarm interrupt pending bit
Return to the Main program
RTC Interrupt Routine
Alarm Occurred = True
ai17271



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