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STM32F427AI 数据表(PDF) 28 Page - STMicroelectronics |
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STM32F427AI 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 240 page  Functional overview STM32F427xx STM32F429xx 28/240 DS9405 Rev 12 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. MS19009V6 V DD time PDR = 1.7 V time NRST PDR_ON PDR_ON Reset by other source than power supply supervisor |
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