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RM0319 bảng dữ liệu(PDF) 319 Page - STMicroelectronics

tên linh kiện RM0319
Giải thích chi tiết về linh kiện  SPEAr320S architecture and functionality
PDF  368 Pages
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RM0319 bảng dữ liệu(HTML) 319 Page - STMicroelectronics

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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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