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Clock Module
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 6-23
6.8.4.11 Loss of Clock in Stop Mode
Table 6-19 shows the resulting actions for a loss of clock in stop mode when the device is being clocked
by the various clocking methods.
Table 6-19. Stop Mode Operation
MODE
In
LOCEN
LOCRE
LOLRE
PLL
OSC
FWKUP
Expected
PLL
Action at
Stop
PLL Action
During Stop
MODE
Out
LOCKSS
LOCK
LOCS
Comments
EXT X X X X X X — — EXT 0 0 0
Lose reference
clock
Stuck — — —
NRM 0 0 0 Off Off 0 Lose lock,
f.b. clock,
reference
clock
Regain NRM ‘LK 1 ‘LC
No regain Stuck — — —
NRM X 0 0 Off Off 1 Lose lock,
f.b. clock,
reference
clock
Regain clocks, but
don’t regain lock
SCM–>
unstable
NRM
0–>‘LK 0–>1 1–>‘LC Block LOCS and
LOCKS until
clock and lock
respectively
regain; enter
SCM regardless
of LOCEN bit
until reference
regained
No reference
clock regain
SCM–> 0–> 0–> 1–> Block LOCS and
LOCKS until
clock and lock
respectively
regain; enter
SCM regardless
of LOCEN bit
No f.b. clock
regain
Stuck — — —
NRM 0 0 0 Off On 0 Lose lock Regain NRM ‘LK 1 ‘LC Block LOCKS
from being
cleared
Lose reference
clock or no lock
regain
Stuck — — —
Lose reference
clock,
regain
NRM ‘LK 1 ‘LC Block LOCKS
from being
cleared