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可以通过smart flash programmer设置lock debug来进行写保护，或者根据手册设置：
The flash memory is organized as a set of 1 or 2 KB pages. The 16 bytes of the upper available page contain page-lock bits and the debug-lock bit. There is one lock bit for each page, except the lock-bit page which is implicitly locked when not in debug mode. When the lock bit for a page is 0, it is impossible to erase or write that page. When the debug lock bit is 0, most of the commands on the debug interface are ignored. The primary purpose of the debug lock bit is to protect the contents of the flash against read-out.
The Flash Controller is used to write and erase the contents of the flash memory.
