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Chapter 1 Device Overview MC9S12ZVM-Family
MC9S12ZVM Family Reference Manual Rev. 1.3
52
Freescale Semiconductor
NOTE
Please refer to the Flash block description for more security byte details.
1.10.3
Operation of the Secured Microcontroller
By securing the device, unauthorized access to the EEPROM and Flash memory contents is prevented.
Secured operation has the following effects on the microcontroller:
1.10.3.1
Normal Single Chip Mode (NS)
•
Background debug controller (BDC) operation is completely disabled.
•
Execution of Flash and EEPROM commands is restricted (described in flash block description).
1.10.3.2
Special Single Chip Mode (SS)
•
Background debug controller (BDC) commands are restricted
•
Execution of Flash and EEPROM commands is restricted (described in flash block description).
In special single chip mode the device is in active BDM after reset. In special single chip mode on a secure
device, only the BDC mass erase and BDC control and status register commands are possible. BDC access
to memory mapped resources is disabled. The BDC can only be used to erase the EEPROM and Flash
memory without giving access to their contents.
1.10.4
Unsecuring the Microcontroller
Unsecuring the microcontroller can be done using three different methods:
1. Backdoor key access
2. Reprogramming the security bits
3. Complete memory erase
1.10.4.1
Unsecuring the MCU Using the Backdoor Key Access
In normal single chip mode, security can be temporarily disabled using the backdoor key access method.
This method requires that:
•
The backdoor key has been programmed to a valid value
•
The KEYEN[1:0] bits within the Flash options/security byte select ‘enabled’.
•
The application program programmed into the microcontroller has the capability to write to the
backdoor key locations
The backdoor key values themselves would not normally be stored within the application data, which
means the application program would have to be designed to receive the backdoor key values from an
external source (e.g. through a serial port)
The backdoor key access method allows debugging of a secured microcontroller without having to erase
the Flash. This is particularly useful for failure analysis.
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 ...