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ST7FL15F1MATRE 数据表(PDF) 36 Page - STMicroelectronics |
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ST7FL15F1MATRE 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 138 page ![]() ST7L15, ST7L19 36/138 POWER SAVING MODES (cont’d) 9.3 WAIT MODE WAIT mode places the MCU into a low power con- sumption mode by stopping the CPU. This power saving mode is selected by calling the ‘WFI’ instruction. All peripherals remain active. During WAIT mode, the I bit of the CC register is cleared to enable all interrupts. All other registers and memory remain unchanged. The MCU remains in WAIT mode until an interrupt or reset occurs, whereupon it wakes up and the Program Counter branches to the start- ing address of the interrupt or reset service rou- tine. Refer to Figure 21. Figure 21. WAIT Mode Flowchart Notes: 1. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set during the interrupt routine and cleared when the CC register is popped. WFI INSTRUCTION RESET INTERRUPT Y N N Y CPU OSCILLATOR PERIPHERALS IBIT ON ON 0 OFF FETCH RESET VECTOR OR SERVICE INTERRUPT CPU OSCILLATOR PERIPHERALS IBIT ON OFF 0 ON CPU OSCILLATOR PERIPHERALS IBIT ON ON X1) ON CYCLE DELAY 256 OR 4096 CPU CLOCK 1 |
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