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NRF52811-QCAA-R bảng dữ liệu(PDF) 72 Page - Nordic Semiconductor |
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NRF52811-QCAA-R bảng dữ liệu(HTML) 72 Page - Nordic Semiconductor |
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72 / 444 page ![]() Power and clock management 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 C B 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 SRC Clock source RC 0 32.768 kHz RC oscillator Xtal 1 32.768 kHz crystal oscillator Synth 2 32.768 kHz synthesized from HFCLK B RW BYPASS Enable or disable bypass of LFCLK crystal oscillator with external clock source Disabled 0 Disable (use with Xtal or low-swing external source) Enabled 1 Enable (use with rail-to-rail external source) C RW EXTERNAL Enable or disable external source for LFCLK Disabled 0 Disable external source (use with Xtal) Enabled 1 Enable use of external source instead of Xtal (SRC needs to be set to Xtal) 5.4.3.20 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 % tSTART_HFINT Startup time 3 us 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 ±40 ppm CL_HFXO Load capacitance 12 pF C0_HFXO Shunt capacitance 7 pF 4454_140 v1.0 72 |
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