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ST72321R9-Auto 数据表(PDF) 63 Page - STMicroelectronics |
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ST72321R9-Auto 数据表(HTML) 63 Page - STMicroelectronics |
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63 / 243 page  ST72321xx-Auto Power saving modes Doc ID 13829 Rev 1 63/243 Figure 23. Slow mode clock transitions 8.3 Wait mode Wait mode places the MCU in a low power consumption 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[1:0] bits of the CC register are forced to ‘10’, 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 Program 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 the following Figure 24. 00 01 SMS CP1:0 fCPU NEW SLOW NORMAL RUN MODE FREQUENCY REQUEST REQUEST fOSC2 fOSC2/2 fOSC2/4 fOSC2 |
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