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ST10F273E Datasheet(PDF) 36 Page - STMicroelectronics |
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ST10F273E Datasheet(HTML) 36 Page - STMicroelectronics |
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36 / 179 page  Internal Flash memory ST10F273E 36/179 5.5 Protection strategy The protection bits are stored in Non Volatile Flash cells, that are read once at reset and stored in 5 Volatile registers. Before they are read from the Non Volatile cells, all the available protections are forced active during reset. The protections can be programmed using the Set Protection operation (see Flash Control Registers paragraph), that can be executed from all the internal or external memories. Two kind of protections are available: write protections to avoid unwanted writings and access protections to avoid piracy. In next paragraphs all different level of protections are shown, and architecture limitations are highlighted as well. 5.5.1 Protection registers The 5 Non Volatile Protection Registers are one time programmable for the user. Two register (FNVWPIRL/FNVWPIRH) are used to store the Write Protection fuses for each sector IFlash module. The other three Registers (FNVAPR0 and FNVAPR1L/H) are used to store the Access Protection fuses. RESER Resume error This bit is automatically set when a suspended Program or Erase operation is not resumed correctly due to a protocol error. In this case the suspended operation is aborted. This bit has to be software reset. WPF Write protection flag This bit is automatically set when trying to program or erase in a sector write protected. In case of multiple Sector Erase, the not protected sectors are erased, while the protected sectors are not erased and bit WPF is set. This bit has to be software reset. Table 18. Flash error register Bit Function |
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