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ST72561J4-Auto Datasheet(PDF) 64 Page - STMicroelectronics |
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ST72561J4-Auto Datasheet(HTML) 64 Page - STMicroelectronics |
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64 / 324 page  Power saving modes ST72561-Auto 64/324 Doc ID 12370 Rev 8 In this mode, the master clock frequency (fOSC2) can be divided by 2, 4, 8 or 16. The CPU and peripherals are clocked at this lower frequency (fCPU). Note: SLOW-WAIT mode is activated by entering WAIT mode while the device is in SLOW mode. Figure 23. SLOW mode clock transitions 7.3 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 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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