Reset Controller Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
10-4
10.5.2
Reset Status Register (RSR)
The RSR contains a status bit for every reset source. When reset is entered, the cause of the reset condition
is latched, along with a value of 0 for the other reset sources that were not pending at the time of the reset
condition. These values are then reflected in RSR. One or more status bits may be set at the same time.
The cause of any subsequent reset is also recorded in the register, overwriting status from the previous reset
condition.
RSR can be read at any time. Writing to RSR has no effect.
4
LVDF
LVD flag. Indicates the low-voltage detect status if LVDE is set. Write a 1 to clear the LVDF bit.
1 Low voltage has been detected
0 Low voltage has not been detected
Note: The setting of this flag causes an LVD interrupt if LVDE and LVDIE bits are set and LVDRE is cleared
when the supply voltage V
DD
drops below V
DD
(minimum). The vector for this interrupt is shared with
INT0 of the EPORT module. Interrupt arbitration in the interrupt service routine is necessary if both of
these interrupts are enabled. Also, LVDF is not cleared at reset; however, it always initializes to a zero
because the part does not come out of reset while in a low-power state (LVDE/LVDRE bits are enabled
out of reset).
3
LVDIE
LVD interrupt enable. Controls the LVD interrupt if LVDE is set. This bit has no effect if the LVDE bit is a logic 0.
1 LVD interrupt enabled
0 LVD interrupt disabled
2
LVDRE
LVD reset enable. Controls the LVD reset if LVDE is set. This bit has no effect if the LVDE bit is a logic 0. LVD
reset has priority over LVD interrupt, if both are enabled.
1 LVD reset enabled
0 LVD reset disabled
1
—
Reserved, should be cleared.
0
LVDE
Controls whether the LVD is enabled.
1 LVD is enabled
0 LVD is disabled
IPSBAR
Offset:
0x11_0001 (RSR)
Access: User read-only
7
6
5
4
3
2
1
0
R
0
LVD
SOFT
0
POR
EXT
LOC
LOL
W
Reset: Reset Dependent
Figure 10-3. Reset Status Register (RSR)
Table 10-3. RCR Field Descriptions (continued)
Field
Description
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
