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NRF52820-QDAA-R Datasheet(PDF) 74 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 74 Page - Nordic Semiconductor |
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74 / 437 page  Power and clock management For more information, see Reference circuitry on page 418. 5.4.2.5 32.768 kHz synthesized from HFCLK (LFSYNT) LFCLK can also be synthesized from the HFCLK clock source. The accuracy of LFCLK will then be the accuracy of the HFCLK. Using the LFSYNT clock avoids the requirement for a 32.768 kHz crystal, but increases average power consumption as the HFCLK will need to be requested in the system. 5.4.3 Registers Base address Peripheral Instance Description Configuration 0x40000000 CLOCK CLOCK Clock control Table 19: Instances Register Offset Description TASKS_HFCLKSTART 0x000 Start HFXO crystal oscillator TASKS_HFCLKSTOP 0x004 Stop HFXO crystal oscillator TASKS_LFCLKSTART 0x008 Start LFCLK TASKS_LFCLKSTOP 0x00C Stop LFCLK TASKS_CAL 0x010 Start calibration of LFRC TASKS_CTSTART 0x014 Start calibration timer TASKS_CTSTOP 0x018 Stop calibration timer EVENTS_HFCLKSTARTED 0x100 HFXO crystal oscillator started EVENTS_LFCLKSTARTED 0x104 LFCLK started EVENTS_DONE 0x10C Calibration of LFRC completed EVENTS_CTTO 0x110 Calibration timer timeout EVENTS_CTSTARTED 0x128 Calibration timer has been started and is ready to process new tasks EVENTS_CTSTOPPED 0x12C Calibration timer has been stopped and is ready to process new tasks INTENSET 0x304 Enable interrupt INTENCLR 0x308 Disable interrupt HFCLKRUN 0x408 Status indicating that HFCLKSTART task has been triggered HFCLKSTAT 0x40C HFCLK status LFCLKRUN 0x414 Status indicating that LFCLKSTART task has been triggered LFCLKSTAT 0x418 LFCLK status LFCLKSRCCOPY 0x41C Copy of LFCLKSRC register, set when LFCLKSTART task was triggered LFCLKSRC 0x518 Clock source for the LFCLK HFXODEBOUNCE 0x528 HFXO debounce time. The HFXO is started by triggering the TASKS_HFCLKSTART task. LFXODEBOUNCE 0x52C LFXO debounce time. The LFXO is started by triggering the TASKS_LFCLKSTART task when the LFCLKSRC register is configured for Xtal. CTIV 0x538 Calibration timer interval Retained Table 20: Register overview 5.4.3.1 TASKS_HFCLKSTART Address offset: 0x000 Start HFXO crystal oscillator 4463_156 v1.0 74 |
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