Chapter 1 Device Overview MC9S12ZVHY/MC9S12ZVHL Families
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
61
NOTE
Please refer to the
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’.
Table 1-9. Security Bits
SEC[1:0]
Security State
00
1 (secured)
01
1 (secured)
10
0 (unsecured)
11
1 (secured)
Содержание MC9S12ZVHL32
Страница 21: ...S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 21 PAGE INTENTIONALLY LEFT BLANK...
Страница 22: ...S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 22 Freescale Semiconductor PAGE INTENTIONALLY LEFT BLANK...
Страница 686: ...Chapter 20 ECC Generation module SRAM_ECCV1 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 686 Freescale Semiconductor...
Страница 752: ...Chapter 22 Supply Voltage Sensor BATSV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 752 Freescale Semiconductor...
Страница 774: ...Chapter 23 LIN Physical Layer S12LINPHYV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 774 Freescale Semiconductor...
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...
Страница 806: ...Appendix G NVM Electrical Parameters S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 806 Freescale Semiconductor...
Страница 810: ...Appendix H BATS Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 810 Freescale Semiconductor...
Страница 816: ...Appendix K OSC32K Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 816 Freescale Semiconductor...
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...
Страница 829: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 830 Freescale Semiconductor O 1 144 LQFP...
Страница 830: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 831...
Страница 831: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 832 Freescale Semiconductor...
Страница 832: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 833 O 2 100 LQFP...
Страница 833: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 834 Freescale Semiconductor...
Страница 834: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 835...
Страница 835: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 836 Freescale Semiconductor...