ColdFire Flash Module (CFM)
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
17-25
Page Erase
The page erase operation erases all memory addresses in a flash logical page using an embedded algorithm.
An example flow to execute the page erase operation is shown in
. The page erase command
write sequence is as follows:
1. Write to any word address in a flash logical page to start the command write sequence for the page
erase command. The word address written determines the flash logical page to erase while the data
written during the page erase command write sequence is ignored.
2. Write the page erase command, $40, to the CFMCMD register.
3. Clear the CBEIF flag by writing a 1 to CBEIF to launch the page erase command.
If the flash logical page to be erased is in a protected sector of the flash memory, the PVIOL flag in the
CFMUSTAT register sets and the page erase command does not launch. After the page erase command has
successfully launched, the CCIF flag in the CFMUSTAT register sets after the page erase operation has
completed, unless a new command write sequence has been buffered.
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
