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ST7FOXU0 Datasheet(PDF) 28 Page - STMicroelectronics |
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ST7FOXU0 Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 123 page  Supply, reset and clock management ST7FOXU0 28/123 Case 2 Switching from AWU RC to internal RC 1. Reset the RC/AWU bit to enable the internal RC oscillator 2. Using a 4-bit counter, wait until 8 internal RC cycles have elapsed. The counter is running on internal RC clock. 3. Wait till the AWU_FLAG is cleared (1AWU RC cycle) and the RC_FLAG is set (2 RC cycles) 4. The switch to the internal RC clock is made at the positive edge of the internal RC clock signal 5. Once the switch is made, the AWU RC is stopped Note: 1 When the internal RC is not selected, it is stopped so as to save power consumption. 2 When the internal RC is selected, the AWU RC is turned on by hardware when entering Auto Wake-Up from Halt mode. 3 When the external clock is selected, the AWU RC oscillator is always on. Figure 9. Clock switching Internal RC AWU RC Set RC/AWU Poll AWU_FLAG until set Internal RC Reset RC/AWU Poll RC_FLAG until set AWU RC |
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