mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 547

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

18.4.2.10 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.
18.4.2.11 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
user-supplied keys match those stored in the Flash security bytes of the Flash configuration field (see
Freescale Semiconductor
Register
Register
FSTAT
FSTAT
Table
CCOBIX[2:0]
MGSTAT1
MGSTAT0
Table 18-49. Unsecure Flash Command FCCOB Requirements
MGSTAT1
MGSTAT0
ACCERR
ACCERR
Error Bit
Error Bit
FPVIOL
FPVIOL
Table 18-48. Erase P-Flash Sector Command Error Handling
000
Table 18-50. Unsecure Flash Command Error Handling
18-9). The Verify Backdoor Access Key command releases security if
S12XS Family Reference Manual, Rev. 1.10
Set if CCOBIX[2:0] != 001 at command launch
Set if command not available in current mode (see
Set if an invalid global address [22:16] is supplied
Set if a misaligned phrase address is supplied (global address [2:0] != 000)
Set if the selected P-Flash sector is protected
Set if any errors have been encountered during the verify operation
Set if any non-correctable errors have been encountered during the verify
operation
Set if CCOBIX[2:0] != 000 at command launch
Set if command not available in current mode (see
Set if any area of the P-Flash or D-Flash memory is protected
Set if any errors have been encountered during the verify operation
Set if any non-correctable errors have been encountered during the verify
operation
0x0B
FCCOB Parameters
Error Condition
Error Condition
Not required
256 KByte Flash Module (S12XFTMR256K1V1)
Table
Table
18-28)
18-28)
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