STM32F427XX datasheet(27/239 Pages) STMICROELECTRONICS | ARM Cortex-M4 32b MCU+FPU, 225DMIPS, up to 2MB Flash/256+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera & LCD-TFT

Part No.	STM32F427XX

Description	ARM Cortex-M4 32b MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera & LCD-TFT

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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STM32F427xx STM32F429xx

Functional overview

43

Figure 7. PDR_ON control with internal reset OFF

3.18

Voltage regulator

The regulator has four operating modes:

•

Regulator ON

–

Main regulator mode (MR)

–

Low power regulator (LPR)

–

Power-down

•

Regulator OFF

3.18.1

Regulator ON

On packages embedding the BYPASS_REG pin, the regulator is enabled by holding

BYPASS_REG low. On all other packages, the regulator is always enabled.

There are three power modes configured by software when the regulator is ON:

•

MR mode used in Run/sleep modes or in Stop modes

–

In Run/Sleep mode

The MR mode is used either in the normal mode (default mode) or the over-drive

mode (enabled by software). Different voltages scaling are provided to reach the

best compromise between maximum frequency and dynamic power consumption.

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