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PC312XDP512F0CFVR Datasheet(PDF) 1232 Page - Freescale Semiconductor, Inc |
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PC312XDP512F0CFVR Datasheet(HTML) 1232 Page - Freescale Semiconductor, Inc |
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1232 / 1348 page  Chapter 30 Security (S12X9SECV2) MC9S12XDP512 Data Sheet, Rev. 2.21 1234 Freescale Semiconductor 30.1.4.1 Normal Single Chip Mode (NS) • Background debug module (BDM) operation is completely disabled. • Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide (FTX) for details. • Tracing code execution using the DBG module is disabled. • Debugging XGATE code (breakpoints, single-stepping) is disabled. 30.1.4.2 Special Single Chip Mode (SS) • BDM firmware commands are disabled. • BDM hardware commands are restricted to the register space. • Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide (FTX) for details. • Tracing code execution using the DBG module is disabled. • Debugging XGATE code (breakpoints, single-stepping) is disabled. Special single chip mode means BDM is active after reset. The availability of BDM firmware commands depends on the security state of the device. The BDM secure firmware first performs a blank check of both the Flash memory and the EEPROM. If the blank check succeeds, security will be temporarily turned off and the state of the security bits in the appropriate Flash memory location can be changed If the blank check fails, security will remain active, only the BDM hardware commands will be enabled, and the accessible memory space is restricted to the peripheral register area. This will allow the BDM to be used to erase the EEPROM and Flash memory without giving access to their contents. After erasing both Flash memory and EEPROM, another reset into special single chip mode will cause the blank check to succeed and the options/security byte can be programmed to “unsecured” state via BDM. While the BDM is executing the blank check, the BDM interface is completely blocked, which means that all BDM commands are temporarily blocked. 30.1.4.3 Expanded Modes (NX, ES, EX, and ST) • BDM operation is completely disabled. • Internal Flash memory and EEPROM are disabled. • Execution of Flash and EEPROM commands is restricted. Please refer to the NVM block guide (FTX) for details. • Tracing code execution using the DBG module is disabled. • Debugging XGATE code (breakpoints, single-stepping) is disabled. • |
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