Level 2: no debug
In this level, the protection level 1 is guaranteed. In addition, the CortexM0 debug capabilities are disabled. Consequently, the debug port (SWD), the boot from RAM (boot RAM mode) and the boot from System memory (boot loader mode) are no more available.
In user execution mode, all operations are allowed on the Main Flash memory. On the contrary, only read and program operations can be performed on the option byte. Option byte are not accessible for erase operations.
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F0手册里没有提到二级加密不能擦写。
Level 2: no debug
In this level, the protection level 1 is guaranteed. In addition, the CortexM0 debug capabilities are disabled. Consequently, the debug port (SWD), the boot from RAM (boot RAM mode) and the boot from System memory (boot loader mode) are no more available.
In user execution mode, all operations are allowed on the Main Flash memory. On the contrary, only read and program operations can be performed on the option byte. Option byte are not accessible for erase operations.
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