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RM0312 数据表(PDF) 84 Page - STMicroelectronics |
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RM0312 数据表(HTML) 84 Page - STMicroelectronics |
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84 / 275 page  Auto-wakeup (AWU) RM0312 84/275 DocID022352 Rev 3 12 Auto-wakeup (AWU) 12.1 Introduction The AWU is used to provide an internal wakeup time base that is used when the MCU goes into Active-halt power saving mode. This time base is clocked by the low speed internal (LSI) RC oscillator clock. 12.2 LSI clock measurement To ensure the best possible accuracy when using the LSI clock, its frequency can be measured with TIM2 timer input capture 1. Figure 14. AWU block diagram COUNTER AWU COUNTER 6-BIT PROG AWUTB[3:0] 15 time bases AWU Interrupt AWUEN & HALT/WAIT MSR APR[5:0] to Timer 2 input capture 1 (for measurement) fLSI fLS LSI RC 38 kHz |
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