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ST7LITEUS5 数据表(PDF) 21 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Flash program memory 21/136 In flash devices, this protection is removed by reprogramming the option. In this case, program memory is automatically erased, and the device can be reprogrammed. Readout 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. Its purpose is to provide advanced security to applications and prevent any change being made to the memory content. Warning: Once set, Write/erase protection can never be removed. A write-protected flash device is no longer reprogrammable. Write/erase protection is enabled through the FMP_W bit in the option byte. 4.6 Related documentation For details on Flash programming and I2C protocol, refer to the ST7 Flash programming reference manual and to the ST7 I2C protocol reference manual. Obsolete Product(s) - Obsolete Product(s) |
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