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ST7LITE49K2 数据表(PDF) 28 Page - STMicroelectronics |
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ST7LITE49K2 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 245 page  Flash programmable memory ST7LITE49K2 28/245 4.5 Memory protection There are two different types of memory protection: Read-Out Protection and Write/Erase Protection which can be applied individually. 4.5.1 Read-out protection Read-Out Protection, when selected provides a protection against program memory content extraction and against write access to Flash memory. Even if no protection can be considered as totally unbreakable, the feature provides a very high level of protection for a general purpose microcontroller. Both program and data EEPROM memory are protected. In Flash devices, this protection is removed by reprogramming the option. In this case, both program and data EEPROM memory are automatically erased and the device can be reprogrammed. Read-Out Protection selection depends on the device type: ● In Flash devices it is enabled and removed through the FMP_R bit in the option byte. ● In ROM devices it is enabled by mask option specified in the option list. 4.5.2 Flash write/erase protection Write/Erase Protection, when set, makes it impossible to both overwrite and erase program memory. It does not apply to EEPROM data. Its purpose is to provide advanced security to applications and prevent any change being made to the memory content. Write/Erase Protection is enabled through the FMP_W bit in the option byte. Caution: Once set, Write/Erase Protection can never be removed. A write-protected Flash device is no longer reprogrammable. 4.6 Related documentation For details on Flash programming and ICC protocol, refer to the ST7 Flash Programming Reference Manual and to the ST7 ICC Protocol Reference Manual. 4.7 Description of Flash control/status register (FCSR) This register controls the XFlash erasing and programming using ICP, IAP or other programming methods. 1st RASS Key: 0101 0110 (56h) 2nd RASS Key: 1010 1110 (AEh) When an EPB or another programming tool is used (in socket or ICP mode), the RASS keys are sent automatically. Reset value: 000 0000 (00h) 7 0 00 000 OPT LAT PGM Read/write |
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