STM32F413RHT6 datasheet(31/207 Pages) STMICROELECTRONICS

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STM32F413xG/H

Functional overview

3.18.3

Regulator ON/OFF and internal reset ON/OFF availability

3.19

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 byte 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 3.20: Low-power

modes).

Table 4. Regulator ON/OFF and internal power supply supervisor availability

Package

Regulator ON

Regulator OFF

Power supply

supervisor ON

Power supply

supervisor OFF

UFQFPN48

Yes

LQFP64

Yes

WLCSP81

Yes

BYPASS_REG

set to VSS

Yes

BYPASS_REG

set to VDD

Yes

PDR_ON

set to VDD

Yes

PDR_ON

set to VSS

LQFP100

Yes

LQFP144

Yes

PDR_ON

set to VDD

Yes

PDR_ON

set to VSS

UFBGA100

Yes

BYPASS_REG

set to VSS

Yes

BYPASS_REG

set to VDD

UFBGA144

Yes

BYPASS_REG

set to VSS

Yes

BYPASS_REG

set to VDD

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