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XC888LM Datasheet(PDF) 29 Page - Infineon Technologies AG |
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XC888LM Datasheet(HTML) 29 Page - Infineon Technologies AG |
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29 / 144 page  XC886/888CLM Functional Description Data Sheet 22 V0.9, 2006-12 BSL mode 6, which is used for enabling Flash protection, can also be used for disabling Flash protection. Here, the programmed password must be provided by the user. A password match triggers an automatic erase of the protected P-Flash and D-Flash contents, including the programmed password. The Flash protection is then disabled upon the next reset. For the ROM device, the ROM is protected at all times and BSL mode 6 is used only to block external access to the device. However, unlike the Flash device, it is not possible to disable the memory protection of the ROM device. Here, entering BSL mode 6 will result in a protection error. Note: If ROM read-out protection is enabled, only read instructions in the ROM memory can target the ROM contents. Although no protection scheme can be considered infallible, the XC886/888 memory protection strategy provides a very high level of protection for a general purpose microcontroller. P-Flash program and erase Possible Not possible Not possible D-Flash contents can be read by Read instructions in any program memory Read instructions in any program memory Read instructions in the P-Flash or D- Flash External access to D-Flash Not possible Not possible Not possible D-Flash program Possible Possible Not possible D-Flash erase Possible Possible, on condition that bit DFLASHEN in register MISC_CON is set to 1 prior to each erase operation Not possible Table 4 Flash Protection Modes (cont’d) Flash Protection Without hardware protection With hardware protection |
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