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STM32F765xx STM32F767xx STM32F768Ax STM32F769xx Functional overview

Figure 7. PDR_ON control with internal reset OFF

2.19 Voltage regulator

The regulator has four operating modes:

• Regulator ON

– Main regulator mode (MR)

– Low power regulator (LPR)

– Power-down

• Regulator OFF

2.19.1 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 modes

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.

The over-drive mode allows operating at a higher frequency than the normal mode

for a given voltage scaling.

– In Stop modes

The MR can be configured in two ways during stop mode:

MR operates in normal mode (default mode of MR in stop mode)

MR operates in under-drive mode (reduced leakage mode).

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