STM32L4 datasheet(11/33 Pages) STMICROELECTRONICS

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STM32L4 データシート(PDF) 11 Page - STMicroelectronics

部品番号	STM32L4

部品情報	This module presentation presents the key differences between the STM32L4 and the STM32L476/L486 devices.

PDF	33 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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11 / 33 page

System Clock Selection

• Switching from Low to High speed or from High to Low speed system

clock, it is recommended to use a transition state with a medium speed

clock for at least 1us.

• Clock source switching conditions:

• Switching from HSE or HSI or MSI to PLL with AHB frequency ( HCLK) higher than

80MHz.

• Switching from PLL with HCLK higher than 80MHz to HSE or HSI or MSI

• Transition state:

• Set the AHB prescaler HPRE[3:0] bits to divide System frequency by 2

• Switch system clock to PLL

• Reconfigure AHB prescaler bits to needed HCLK frequency

In STM32L4+ Series devices, it is recommended to use a

transition state while switching from Low to High speed or

from High to Low speed system clock. This slide presents

the recommended sequence for the transition state.

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