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STM32U545NET6QTR 数据表(PDF) 46 Page - STMicroelectronics |
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STM32U545NET6QTR 数据表(HTML) 46 Page - STMicroelectronics |
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46 / 283 page  Functional overview STM32U545xx 46/283 DS14216 Rev 1 • Startup clock: after reset, the microcontroller restarts by default with MSI. The prescaler ratio and clock source can be changed by the application program as soon as the code execution starts. • CSS (clock security system): this feature can be enabled by software. If a HSE clock failure occurs, the master clock automatically switches to HSI16 and a software interrupt is generated if enabled. LSE failure can also be detected and generates an interrupt. • Clock-out capability: – MCO (microcontroller clock output): it outputs one of the internal clocks for external use by the application. – LSCO (low-speed clock output): it outputs LSI or LSE in all low-power modes (except VBAT mode). Several prescalers allow AHB and APB frequencies configuration. The maximum frequency of the AHB and the APB clock domains is 160 MHz. |
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