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NRF51822-CFAB-R 数据表(PDF) 28 Page - Nordic Semiconductor |
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NRF51822-CFAB-R 数据表(HTML) 28 Page - Nordic Semiconductor |
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28 / 130 page  Page 28 nRF51822 Product Specification v3.3 3.6 Clock management (CLOCK) The advanced clock management system can source the system clocks from a range of internal or external high and low frequency oscillators and distribute them to modules based upon a module’s individual requirements. This prevents large clock trees from being active and drawing power when system modules needing this clock reference are not active. If an application enables a module that needs a clock reference without the corresponding oscillator running, the clock management system will automatically enable the RC oscillator option and provide the clock. When the module goes back to idle, the clock management will automatically set the oscillator to idle. To avoid delays involved in starting a given oscillator, or if a specific oscillator is required, the application can override the automatic oscillator management so it keeps oscillators active when no system modules require the clock reference. Clocks are only available in System ON mode and can be generated by the sources listed in Table 11. Table 11 Clock properties Figure 6 Clock management Clock Source Frequency options High Frequency Clock (HFCLK)1 1. External Crystal must be used for Radio operation. External Crystal (XOSC) 16/32 MHz2 2. The HFCLK will be 16 MHz for both the 16 and 32 MHz crystal option. External clock reference3 3. See the nRF51 Series Reference Manual for more details on external clock reference. 16 MHz Internal RC Oscillator (RCOSC) 16 MHz Low Frequency Clock (LFCLK) External Crystal (XOSC) 32.768 kHz External clock reference3 32.768 kHz Synthesized from HFCLK 32.768 kHz Internal RC Oscillator (RCOSC) 32.768 kHz 32.768 kHz RC oscillator 32.768 kHz crystal oscillator 16 MHz RC oscillator 16/32 MHz crystal oscillator LFCLK clock control HFCLK clock control HFCLK LFCLK LFCLKSRC LFCLKSTART LFCLKSTOP LFCLKSTARTED HFCLKSTART HFCLKSTOP HFCLKSTARTED Request from the rest of the system XL1 XL2 XC1 XC2 32.768 kHz synthesizer HFCLKSRC |
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