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Chapter 19 128 KB Flash Module (S12ZFTMRZ128K512V2)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
735
19.4.7.17 Protection Override Command
The Protection Override command allows the user to temporarily override the protection limits, either
decreasing, increasing or disabling protection limits, on P-Flash and/or EEPROM, if the comparison key
provided as a parameter loaded on FCCOB matches the value of the key previously programmed on the
Flash Configuration Field (see
). The value of the Protection Override Comparison Key must
not be 16’hFFFF, that is considered invalid and if used as argument will cause the Protection Override
feature to be disabled. Any valid key value that does not match the value programmed in the Flash
Configuration Field will cause the Protection Override feature to be disabled. Current status of the
Protection Override feature can be observed on FPSTAT FPOVRD bit (see
Protection Status Register (FPSTAT)
).
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.
Table 19-68. Protection Override Command FCCOB Requirements
Register
FCCOB Parameters
FCCOB0
0x13
Protection Update Selection
[1:0] See
FCCOB1
Comparison Key
FCCOB2
reserved
New FPROT value
FCCOB3
reserved
New DFPROT value
Table 19-69. Protection Override selection description
Protection Update
Selection code [1:0]
Protection register selection
bit 0
Update P-Flash protection
0 - keep unchanged (do not update)
1 - update P-Flash protection with new FPROT value loaded on FCCOB
bit 1
Update EEPROM protection
0 - keep unchanged (do not update)
1 - update EEPROM protection with new DFPROT value loaded on FCCOB
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...