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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 319 Page - STMicroelectronics |
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RM0319 датащи(HTML) 319 Page - STMicroelectronics |
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319 / 368 page  RM0319 System controller (SYSCTR) Doc ID 022640 Rev 3 319/368 29.3.2 System control state machine Figure 107. System mode control state machine Crystal oscillator and PLL control The system control state machine (Section 29.3.2: System control state machine) can also be used to control the crystal oscillator and the PLL. Nevertheless, software can be used to override control of the crystal and PLL by using the crystal control register (SCXTALCTRL) and the PLL control register (SCPLLCTRL). PLL frequency control To define the frequency of the clock generated from the PLL, the system controller provides a PLL frequency control register (SCPLLFCTRL, Section 29.3.5). PLLSW NORMAL SW From PLL NORMAL PLL SW NORMAL PLLON ||(PLLTIMEEN && PLL Timeout) SW to PLL SLOW SW From XTAL DOZE XTAL CTL SW to XTAL SLOW&NORMAL XTALSW SLOW | NORMAL XTALON ||(XTALTIMEEN && XTAL Timeout) XTAL SW IRQ | FIQ DOZE&SLOW&NORMAL &STANDBYWFI nPOR SLEEP PLL CTL |
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