STM32F412XE datasheet(24/201 Pages) STMICROELECTRONICS

24 / 201 page

Functional overview

STM32F412xE/G

24/201

DocID028087 Rev 7

3.16

Boot modes

At startup, boot pins are used to select one out of three boot options:

•

Boot from user Flash memory

•

Boot from system memory

•

Boot from embedded SRAM

The boot loader is located in system memory. It is used to reprogram the Flash memory by

using one of the interface listed in the Table 3 or the USB OTG FS in device mode through

DFU (device firmware upgrade).

For more detailed information on the bootloader, refer to Application Note: AN2606,

STM32™ microcontroller system memory boot mode.

3.17

Power supply schemes

•

VDD = 1.7 to 3.6 V: external power supply for I/Os with the internal supervisor

(POR/PDR) disabled, provided externally through VDD pins. Requires the use of an

external power supply supervisor connected to the VDD and NRST pins.

•

VSSA, VDDA = 1.7 to 3.6 V: external analog power supplies for ADC, Reset blocks, RCs

and PLL. VDDA and VSSA must be connected to VDD and VSS, respectively, with

decoupling technique.

Note:

The VDD/VDDA minimum value of 1.7 V is obtained with the use of an external power supply

supervisor (refer to Section 3.18.2: Internal reset OFF). Refer to Table 4: Regulator ON/OFF

and internal power supply supervisor availability to identify the packages supporting this

option.

•

VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and

backup registers (through power switch) when VDD is not present.

•

VDDUSB can be connected either to VDD or an external independent power supply (3.0

to 3.6 V) for USB transceivers.

For example, when device is powered at 1.8 V, an independent power supply 3.3V can

be connected to VDDUSB. When the VDDUSB is connected to a separated power supply,

Table 3. Embedded bootloader interfaces

Package

USART1

PA9/

PA10

USART2

PD6/

PD5

USART3

PB11/

PB10

I2C1

PB6/

PB7

I2C2

PF0/

PF1

I2C3

PA8/

PB4

I2C

FMP1

PB14/

PB15

SPI1

PA4/

PA5/

PA6/

PA7

SPI3

PA15/

PC10/

PC11/

PC12

SPI4

PE11/

PE12/

PE13/

PE14

CAN2

PB5/

PB13

USB

PA11

/P12

UFQFPN48

WLCSP64

LQFP64

LQFP100Y

YYY

LQFP144

YYY

UFBGA100

UFBGA144

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