Chapter 29 1024 KByte Flash Module (S12XFTM1024K5V2)
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
1185
29.4.2.11 Unsecure Flash Command
The Unsecure Flash command will erase the entire P-Flash and D-Flash memory space and, if the erase is
successful, will release security.
Upon clearing CCIF to launch the Unsecure Flash command, the Memory Controller will erase the entire
P-Flash and D-Flash memory space and verify that it is erased. If the Memory Controller verifies that the
entire Flash memory space was properly erased, security will be released. If the erase verify is not
successful, the Unsecure Flash operation sets MGSTAT1 and terminates without changing the security
state. During the execution of this command (CCIF=0) the user must not write to any Flash module
register. The CCIF flag is set after the Unsecure Flash operation has completed.
29.4.2.12 Verify Backdoor Access Key Command
The Verify Backdoor Access Key command will only execute if it is enabled by the KEYEN bits in the
FSEC register (see
). The Verify Backdoor Access Key command releases security if user-
supplied keys match those stored in the Flash security bytes of the Flash configuration field (see
).
FERSTAT
EPVIOLIF
None
Table 29-53. Unsecure Flash Command FCCOB Requirements
CCOBIX[2:0]
FCCOB Parameters
000
0x0B
Not required
Table 29-54. Unsecure Flash Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 000 at command launch
Set if a Load Data Field command sequence is currently active
Set if command not available in current mode (see
)
FPVIOL
Set if any area of the P-Flash memory is protected
MGSTAT1
Set if any errors have been encountered during the verify operation
MGSTAT0
Set if any non-correctable errors have been encountered during the verify
operation
FERSTAT
EPVIOLIF
Set if any area of the buffer RAM EEE partition is protected
Table 29-52. Erase P-Flash Sector Command Error Handling (continued)
Register
Error Bit
Error Condition
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:
S12XE
products
in
208
MAPBGA
packages
