Chapter 21 64 KB Flash Module (S12ZFTMRZ64K2KV2)
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
737
If the comparison key successfully matches the key programmed in the Flash Configuration Field the
Protection Override command will preserve the current values of registers FPROT and DFPROT stored in
an internal area and will override these registers as selected by the Protection Update Selection field with
the value(s) loaded on FCCOB parameters. The new values loaded into FPROT and/or DFPROT can
reconfigure protection without any restriction (by increasing, decreasing or disabling protection limits). If
the command executes successfully the FPSTAT FPOVRD bit will set.
If the comparison key does not match the key programmed in the Flash Configuration Field, or if the key
loaded on FCCOB is 16’hFFFF, the value of registers FPROT and DFPROT will be restored to their
original contents before executing the Protection Override command and the FPSTAT FPOVRD bit will
be cleared. If the contents of the Protection Override Comparison Key in the Flash Configuration Field is
left in the erased state (i.e. 16’hFFFF) the Protection Override feature is permanently disabled. If the
command execution is flagged as an error (ACCERR being set for incorrect command launch) the values
of FPROT and DFPROT will not be modified.
The Protection Override command can be called multiple times and every time it is launched it will
preserve the current values of registers FPROT and DFPROT in a single-entry buffer to be restored later;
when the Protection Override command is launched to restore FPROT and DFPROT these registers will
assume the values they had before executing the Protection Override command on the last time. If contents
of FPROT and/or DFPROT registers were modified by direct register writes while protection is overridden
these modifications will be lost. Running Protection Override command to restore the contents of registers
FPROT and DFPROT will not force them to the reset values.
bit 1
Update EEPROM protection
0 - keep unchanged (do not update)
1 - update EEPROM protection with new DFPROT value loaded on FCCOB
Table 21-70. Protection Override Command Error Handling
Register
Error Bit
Error Condition
FSTAT
ACCERR
Set if CCOBIX[2:0] != (001, 010 or 011) at command launch.
Set if command not available in current mode (see
Set if protection is supposed to be restored (if key does not match or is invalid) and
Protection Override command was not run previously (bit FPSTAT FPOVRD is 0),
so there are no previous valid values of FPROT and DFPROT to be re-loaded.
Set if Protection Update Selection[1:0] = 00 (in case of CCOBIX[2:0] = 010 or 011)
Set if Protection Update Selection[1:0] = 00, CCOBIX[2:0] = 001 and a valid
comparison key is loaded as a command parameter.
FPVIOL
None
MGSTAT1
None
MGSTAT0
None
Table 21-69. Protection Override selection description
Protection Update
Selection code [1:0]
Protection register selection
Содержание MC9S12ZVHL32
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Страница 788: ...Appendix A MCU Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 788 Freescale Semiconductor...
Страница 794: ...Appendix B ADC Electricals S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 794 Freescale Semiconductor...
Страница 798: ...Appendix D IRC Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 798 Freescale Semiconductor...
Страница 802: ...Appendix F MSCAN Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 802 Freescale Semiconductor...
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Страница 822: ...Appendix L SPI Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 822 Freescale Semiconductor...
Страница 826: ...Appendix M LINPHY Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 826 Freescale Semiconductor...
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