Specifications

System Controller and Configuration Logic
2-8 Copyright © 2004, 2006 ARM Limited. All rights reserved. ARM DDI 0287B
If the nPOR input is activated, the state machine and the required operating mode in the
system control register are set to DOZE. If the PRESETn input is activated, the system
mode control state machine does not change mode but the required operating mode is
set to DOZE in the system control register.
Figure 2-3 System mode control state machine
NORMAL
XTALEN
XTALRQSW
PLLEN
PLLRQSW
PLLSW
SW from PLL
XTALEN
XTALRQSW
PLLEN
NORMAL
PLLON || (PLLTIMEEN && PLLTimeout)
NORMAL
XTALSW
XTAL CTL
XTALEN
XTALON || (XTALTIMEEN && XtalTimeout)
PLLSW
SW from XTAL
XTALEN
SLOW &
NORMAL
DOZE
SLOW|
NORMAL
nPOR
SLEEP
SLEEPMODE
IRQ/FIQ
XTALSW
DOZE &
SLOW &
NORMAL
SW to PLL
XTALEN
XTALRQSW
PLLEN
PLLRQSW
PLL CTL
XTALEN
XTALRQSW
PLLEN
SLOW
XTALEN
XTALRQSW
SW to XTAL
XTALEN
XTALRQSW