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ST7DALIF2 Datasheet(PDF) 50 Page - STMicroelectronics |
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ST7DALIF2 Datasheet(HTML) 50 Page - STMicroelectronics |
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50 / 171 page  Power saving modes ST7DALIF2 50/171 11 Power saving modes 11.1 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 20): ■ Slow ■ Wait (and Slow-Wait) ■ Active-halt ■ Auto Wake up 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 20. Power saving mode transitions 11.2 Slow mode This mode has two targets: ● To reduce power consumption by decreasing the internal clock in the device, ● To adapt the internal clock frequency (fCPU) to the available supply voltage. Slow mode is controlled by the SMS bit in the MCCSR register which enables or disables Slow mode. POWER CONSUMPTION Wait Slow RUN Active-halt High Low Slow Wait AUTO WAKE UP FROM Halt Halt |
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