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ST7L15 Datasheet(PDF) 12 Page - STMicroelectronics |
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ST7L15 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 138 page  ST7L15, ST7L19 12/138 FLASH PROGRAM MEMORY (cont’d) 4.5 MEMORY PROTECTION There are two different types of memory protec- tion: Readout Protection and Write/Erase Protec- tion, which can be applied individually. 4.5.1 Readout Protection Readout protection, when selected, protects against program memory content extraction and against write access to Flash memory. Even if no protection can be considered as totally unbreaka- ble, the feature provides a very high level of pro- tection for a general purpose microcontroller. Both program and data E2 memory are protected. In Flash devices, this protection is removed by re- programming the option. In this case, both pro- gram and data E2 memory are automatically erased and the device can be reprogrammed. Readout protection selection depends on the de- vice 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 the mask option specified in the Option List. 4.5.2 Flash Write/Erase Protection Write/erase protection, when set, makes it impos- sible to both overwrite and erase program memo- ry. It does not apply to E2 data. Its purpose is to provide advanced security to applications and pre- vent any change being made to the memory con- tent. 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 ICC proto- col, refer to the ST7 Flash Programming Refer- ence Manual and to the ST7 ICC Protocol Refer- ence Manual . 4.7 REGISTER DESCRIPTION FLASH CONTROL/STATUS REGISTER (FCSR) Read/Write Reset Value: 000 0000 (00h) 1st RASS Key: 0101 0110 (56h) 2nd RASS Key: 1010 1110 (AEh) Note: This register is reserved for programming using ICP, IAP or other programming methods. It controls the XFlash programming and erasing op- erations. When an EPB or another programming tool is used (in socket or ICP mode), the RASS keys are sent automatically. 70 00 000 OPT LAT PGM 1 |
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