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The RTC and the backup registers are supplied through a switch that takes power either on VDD supply when present or through the VBAT pin. The backup registers are ten 16-bit registers used to store 20 bytes of user application data when VDD power is not present.

The real-time clock provides a set of continuously running counters which can be used with suitable software to provide a clock calendar function, and provides an alarm interrupt and a periodic interrupt.

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 when unlocking stm32f103c6 secured microprocessor’s program. The internal low-power RC has a typical frequency of 40 kHz. The RTC can be calibrated using an external 512 Hz output to compensate for any natural crystal deviation.

The RTC features a 32-bit programmable counter for long-term measurement using the Compare register to generate an alarm. A 20-bit prescaler is used for the time base clock and is by default configured to generate a time base of 1 second from a clock at 32.768 kHz.

The medium-density STM32F103xx performance line devices include an advanced-control timer, three general-purpose timers by reading locked stm32f105vb microcontroller flash eeprom data, two watchdog timers and a SysTick timer. Table 4 compares the features of the advanced-control and general-purpose timers.