STM32F042X4 datasheet(16/117 Pages) STMICROELECTRONICS

tên linh kiện	STM32F042X4

Giải thích chi tiết về linh kiện	Reset and power management

PDF	117 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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16 / 117 page

Functional overview

STM32F042x4 STM32F042x6

16/117

DocID025832 Rev 5

3.6

Clocks and startup

System clock selection is performed on startup, however the internal RC 8 MHz oscillator is

selected as default CPU clock on reset. An external 4-32 MHz clock can be selected, in

which case it is monitored for failure. If failure is detected, the system automatically switches

back to the internal RC oscillator. A software interrupt is generated if enabled. Similarly, full

interrupt management of the PLL clock entry is available when necessary (for example on

failure of an indirectly used external crystal, resonator or oscillator).

Several prescalers allow the application to configure the frequency of the AHB and the APB

domains. The maximum frequency of the AHB and the APB domains is 48 MHz.

Additionally, also the internal RC 48 MHz oscillator can be selected for system clock or PLL

input source. This oscillator can be automatically fine-trimmed by the means of the CRS

peripheral using the external synchronization.

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