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ST72344S4 bảng dữ liệu(PDF) 64 Page - STMicroelectronics |
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ST72344S4 bảng dữ liệu(HTML) 64 Page - STMicroelectronics |
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64 / 247 page  Power-saving modes ST72344xx, ST2345xx 64/247 Doc ID 12321 Rev 6 9 Power-saving modes 9.1 Introduction To give a large measure of flexibility to the application in terms of power consumption, five main power saving modes are implemented in the ST7 (see Figure 25): ● Slow ● Wait (and Slow-Wait) ● Active-halt ● Auto-wakeup from Halt (AWUFH) ● Halt After a reset the normal operating mode is selected by default (Run mode). This mode drives the device (CPU and embedded peripherals) by means of a master clock which is based on the main oscillator frequency divided or multiplied by 2 (fOSC2). From Run mode, the different power saving modes may be selected by setting the relevant register bits or by calling the specific ST7 software instruction whose action depends on the oscillator status. Figure 25. Power saving mode transitions Power consumption Wait Slow Run Active-halt High Low Slow-wait Auto-wakeup from Halt Halt |
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