128 KByte Flash Module (S12XFTMR128K1V1)
MC9S12XHY-Family Reference Manual, Rev. 1.01
Freescale Semiconductor
657
19.3.2.10 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.
19.3.2.11 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
Table 19-6
). 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
Table 19-45. Erase P-Flash Sector Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 001 at command launch
Set if command not available in current mode (see
Table 19-25
)
Set if an invalid global address [22:16] is supplied
Set if a misaligned phrase address is supplied (global address [2:0] != 000)
FPVIOL
Set if the selected P-Flash sector 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
Table 19-46. Unsecure Flash Command FCCOB Requirements
CCOBIX[2:0]
FCCOB Parameters
000
0x0B
Not required
Table 19-47. Unsecure Flash Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != 000 at command launch
Set if command not available in current mode (see
Table 19-25
)
FPVIOL
Set if any area of the P-Flash or D-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
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