STM32F413XG Datasheet, PDF (31/207 Pages) STMicroelectronics – ARM-Cortex-M4 32b MCU+FPU, 125 DMIPS, up to 1.5MB Flash, 320KB RAM, USB OTG FS, 1 ADC, 2 DACs, 2 DFSDMs

STM32F413xG/H
Functional overview
3.18.3 Regulator ON/OFF and internal reset ON/OFF availability
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
LQFP64
WLCSP81
LQFP100
LQFP144
UFBGA100
UFBGA144
Yes
Yes
Yes
BYPASS_REG
set to V_SS
Yes
Yes
Yes
BYPASS_REG
set to V_SS
Yes
BYPASS_REG
set to V_SS
No
No
Yes
BYPASS_REG
set to V_DD
No
No
Yes
BYPASS_REG
set to V_DD
Yes
BYPASS_REG
set to V_DD
Yes
Yes
Yes
PDR_ON
set to V_DD
Yes
Yes
PDR_ON
set to V_DD
No
No
Yes
PDR_ON
set to V_SS
No
Yes
PDR_ON
set to V_SS
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 V_DD 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).
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