STM32F410RB datasheet(23/142 Pages) STMICROELECTRONICS

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STM32F410x8/B

Functional overview

3.17

Real-time clock (RTC) and backup registers

The backup domain includes:

•

The real-time clock (RTC)

•

20 backup registers

The real-time clock (RTC) is an independent BCD timer/counter. Dedicated registers contain

the second, minute, hour (in 12/24 hour), week day, date, month, year, in BCD (binary-

coded decimal) format. Correction for 28, 29 (leap year), 30, and 31 day of the month are

performed automatically. The RTC features a reference clock detection, a more precise

second source clock (50 or 60 Hz) can be used to enhance the calendar precision. The RTC

provides a programmable alarm and programmable periodic interrupts with wakeup from

Stop and Standby modes. The sub-seconds value is also available in binary format.

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. The internal low-speed RC

has a typical frequency of 32 kHz. The RTC can be calibrated using an external 512 Hz

output to compensate for any natural quartz deviation.

Two alarm registers are used to generate an alarm at a specific time and calendar fields can

be independently masked for alarm comparison. To generate a periodic interrupt, a 16-bit

programmable binary auto-reload downcounter with programmable resolution is available

and allows automatic wakeup and periodic alarms from every 120 µs to every 36 hours.

A 20-bit prescaler is used for the time base clock. It is by default configured to generate a

time base of 1 second from a clock at 32.768 kHz.

The backup registers are 32-bit registers used to store 80 bytes of user application data

when VDD power is not present. Backup registers are not reset by a system, a power reset,

or when the device wakes up from the Standby mode (see Section 3.18: Low-power

modes).

Additional 32-bit registers contain the programmable alarm subseconds, seconds, minutes,

hours, day, and date.

The RTC and backup registers are supplied through a switch that is powered either from the

VDD supply when present or from the VBAT pin.

3.18

Low-power modes

The devices support three low-power modes to achieve the best compromise between low

power consumption, short startup time and available wakeup sources:

•

Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs.

To further reduce the power consumption, the Flash memory can be switched off

before entering in Sleep mode. Note that this requires a code execution from the RAM.

•

Stop mode

The Stop mode achieves the lowest power consumption while retaining the contents of

SRAM and registers. All clocks in the 1.2 V domain are stopped, the PLL, the HSI RC

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