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NRF52820-QDAA-R7 Datasheet(PDF) 82 Page - Nordic Semiconductor |
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NRF52820-QDAA-R7 Datasheet(HTML) 82 Page - Nordic Semiconductor |
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82 / 437 page  Power and clock management LFXO debounce time. The LFXO is started by triggering the TASKS_LFCLKSTART task when the LFCLKSRC register is configured for Xtal. The EVENTS_LFCLKSTARTED event is generated after the LFXO debounce time has elapsed. It is not allowed to change the value of this register while the LFXO is starting. Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ID A Reset 0x00000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ID Access Field Value ID Value Description A RW LFXODEBOUNCE LFXO debounce time. Normal 0 8192 32.768 kHz periods, or 0.25 s. Recommended for normal Operating Temperature conditions. Extended 1 16384 32.768 kHz periods, or 0.5 s. Recommended for Extended Operating Temperature conditions. 5.4.3.24 CTIV ( Retained ) Address offset: 0x538 This register is a retained register Calibration timer interval Bit number 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ID A A A A A A A Reset 0x00000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ID Access Field Value ID Value Description A RW CTIV Calibration timer interval in multiple of 0.25 seconds. Range: 0.25 seconds to 31.75 seconds. 5.4.4 Electrical specification 5.4.4.1 64 MHz internal oscillator (HFINT) Symbol Description Min. Typ. Max. Units fNOM_HFINT Nominal output frequency 64 MHz fTOL_HFINT Frequency tolerance ±1.5 ±8 % fTOL_HFINT,EXT Frequency tolerance, extended temperature range ±9 % 5.4.4.2 64 MHz crystal oscillator (HFXO) Symbol Description Min. Typ. Max. Units fNOM_HFXO Nominal output frequency 64 MHz fXTAL_HFXO External crystal frequency 32 MHz fTOL_HFXO Frequency tolerance requirement for 2.4 GHz proprietary radio applications ±60 ppm fTOL_HFXO_BLE Frequency tolerance requirement, Bluetooth low energy applications, packet length ≤ 200 bytes ±40 ppm fTOL_HFXO_BLE_LP Frequency tolerance requirement, Bluetooth low energy applications, packet length > 200 bytes ±30 ppm CL_HFXO Load capacitance 12 pF 4463_156 v1.0 82 |
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