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ST72260G bảng dữ liệu(PDF) 34 Page - STMicroelectronics |
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ST72260G bảng dữ liệu(HTML) 34 Page - STMicroelectronics |
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34 / 171 page ![]() ST72260G, ST72262G, ST72264G 34/171 POWER SAVING MODES (Cont’d) 8.3 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” ST7 software instruction. All peripherals remain active. During WAIT mode, the I [1:0] bits in the CC register are forced to ‘10b’, 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 Figure 23. Figure 23. WAIT Mode Flowchart Note: 1. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits in the CC reg- ister are set during the interrupt routine and cleared when the CC register is popped. WFI INSTRUCTION RESET INTERRUPT Y N N Y CPU OSCILLATOR PERIPHERALS I[1:0] BITS ON ON 0 OFF FETCH RESET VECTOR OR SERVICE INTERRUPT CPU OSCILLATOR PERIPHERALS I[1:0] BITS ON OFF 1 ON CPU OSCILLATOR PERIPHERALS I[1:0] BITS ON ON XX 1) ON 4096 CPU CLOCK CYCLE DELAY |
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