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STM32F405XX Datasheet(PDF) 30 Page - STMicroelectronics

Part # STM32F405XX
Description  ARM Cortex-M4 32b MCUFPU, 210DMIPS, up to 1MB Flash/1924KB RAM, USB OTG HS/FS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F405XX Datasheet(HTML) 30 Page - STMicroelectronics

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Description
STM32F405xx, STM32F407xx
30/185
DocID022152 Rev 4
Standby mode, the SRAM and register contents are lost except for registers in the
backup domain and the backup SRAM when selected.
The device exits the Standby mode when an external reset (NRST pin), an IWDG reset,
a rising edge on the WKUP pin, or an RTC alarm / wakeup / tamper /time stamp event
occurs.
The standby mode is not supported when the embedded voltage regulator is bypassed
and the V
12 domain is controlled by an external power.
2.2.20
VBAT operation
The VBAT pin allows to power the device VBAT domain from an external battery, an external
supercapacitor, or from VDD when no external battery and an external supercapacitor are
present.
VBAT operation is activated when VDD is not present.
The VBAT pin supplies the RTC, the backup registers and the backup SRAM.
Note:
When the microcontroller is supplied from VBAT, external interrupts and RTC alarm/events
do not exit it from VBAT operation.
When PDR_ON pin is not connected to VDD (internal reset OFF), the VBAT functionality is no
more available and VBAT pin should be connected to VDD.
2.2.21
Timers and watchdogs
The STM32F405xx and STM32F407xx 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 4 compares the features of the advanced-control, general-purpose and basic timers.
Table 4. Timer feature comparison
Timer
type
Timer
Counter
resolutio
n
Counter
type
Prescaler
factor
DMA
request
generatio
n
Capture/
compare
channels
Complementar
y output
Max
interface
clock
(MHz)
Max
timer
clock
(MHz)
Advanced
-control
TIM1,
TIM8
16-bit
Up,
Down,
Up/dow
n
Any integer
between 1
and 65536
Yes
4
Yes
84
168


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