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STM32L4 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 STM32L4
상세설명  This module presentation presents the key differences between the STM32L4 and the STM32L476/L486 devices.
PDF  33 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L4 데이터시트(HTML) 11 Page - STMicroelectronics

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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
10
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.
10



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