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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9805 датащи(PDF) 24 Page - STMicroelectronics |
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L9805 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 103 page  24/103 L9805 3.7 POWER SAVING MODES 3.7.1 Introduction There are three Power Saving modes. The Slow Mode may be selected by setting the relevant bits in the Miscellaneous register as detailed in Section 3.4. Wait and Halt modes may be entered using the WFI and HALT instructions. 3.7.2 Slow Mode In Slow mode, the oscillator frequency can be di- vided by 4, 8, 16 or 32 rather than by 2. The CPU and peripherals (except CAN, see Note) are clocked at this lower frequency. Slow mode is used to reduce power consumption. Note: Before entering Slow mode and to guaran- tee low power operations, the CAN Controller must be placed by software in STANDBY mode. 3.7.3 Wait Mode Wait mode places the MCU in a low power con- sumption mode by stopping the CPU. All peripher- als remain active. During Wait mode, the I bit (CC Register) is cleared, so as to enable all interrupts. All other registers and memory remain un- changed. The MCU will remain in Wait mode until an Interrupt or Reset occurs, whereupon the Pro- gram 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 (coming from CAN, Timers 1 & 2, EEPROM, ADC, PWM 1 & 2, I/O ports peripherals and Power Bridge) occurs, causing its wake-up. Refer to Figure 12 below. Figure 12. Wait Mode Flow Chart WAIT INSTRUCTION RESET FETCH RESET VECTOR OR SERVICE INTERRUPT INTERRUPT Y N N Y CPU CLOCK OSCILLATOR PERIPH. CLOCK I-BIT ON ON SET ON CPU CLOCK OSCILLATOR PERIPH. CLOCK I-BIT ON ON CLEARED OFF |
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