Freescale Semiconductor MCF52230 ColdFire, Reference Manual

Page: 126 / 660

Clock Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 7-17
7.8.3.11 Loss of Clock in Stop Mode
Table 7-11 shows the resulting actions for a loss of clock in stop mode when the device is being clocked
by the various clocking methods.
Table 7-11. Stop Mode Operation
MODE
In
LO
CEN
LOCRE
LO
LRE
PLL
OSC
FWKUP
Expected
PLL
Action at
Stop
PLL Action
During Stop
MODE
Out
LOCKSS
LO
CK
LO
CS
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
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60