DocID13902 Rev 15 474/1128
RM0008 Real-time clock (RTC)
484
18.2 RTC main features
• Programmable prescaler: division factor up to 2
20
• 32-bit programmable counter for long-term measurement
• Two separate clocks: PCLK1 for the APB1 interface and RTC clock (must be at least
four times slower than the PCLK1 clock)
• The RTC clock source could be any of the following ones:
– HSE clock divided by 128
– LSE oscillator clock
– LSI oscillator clock (refer to Section 7.2.8: RTC clock for details)
• Two separate reset types:
– The APB1 interface is reset by system reset
– The RTC Core (Prescaler, Alarm, Counter and Divider) is reset only by a Backup
domain reset (see Section 7.1.3: Backup domain reset on page 92).
• Three dedicated maskable interrupt lines:
– Alarm interrupt, for generating a software programmable alarm interrupt.
– Seconds interrupt, for generating a periodic interrupt signal with a programmable
period length (up to 1 second).
– Overflow interrupt, to detect when the internal programmable counter rolls over to
zero.
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