Datasheet

Functional overview STM32F745xx STM32F746xx
32/227 DocID027590 Rev 4
2.21 V
BAT
operation
The V
BAT
pin allows to power the device V
BAT
domain from an external battery, an external
supercapacitor, or from V
DD
when no external battery and an external supercapacitor are
present.
V
BAT
operation is activated when V
DD
is not present.
The V
BAT
pin supplies the RTC, the backup registers and the backup SRAM.
Note: When the microcontroller is supplied from V
BAT
, external interrupts and RTC alarm/events
do not exit it from V
BAT
operation.
When PDR_ON pin is connected to V
SS
(Internal Reset OFF), the V
BAT
functionality is no
more available and V
BAT
pin should be connected to VDD.
2.22 Timers and watchdogs
The devices include two advanced-control timers, eight general-purpose timers, two basic
timers and two watchdog timers.
All timer counters can be frozen in debug mode.
Table 6 compares the features of the advanced-control, general-purpose and basic timers.
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.