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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST7L09 数据表(PDF) 32 Page - STMicroelectronics |
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ST7L09 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 104 page  ST7L05, ST7L09 32/104 POWER SAVING MODES (Cont’d) 9.3 WAIT MODE WAIT mode places the MCU in 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 the Pro- gram Counter branches to the starting address of the interrupt or reset service routine. The MCU will remain in WAIT mode until a Reset or an Interrupt occurs, causing it to wake up. Refer to Figure 18. Figure 18. 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 256 CPU CLOCK CYCLE DELAY 1 |
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