STM8AP528A Просмотр технического описания (PDF) - STMicroelectronics
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STM8AP528A Datasheet PDF : 125 Pages
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Product overview
STM8AF526x/8x/Ax STM8AF6269/8x/Ax
5.4.2
5.4.3
Write protection (WP)
Write protection in application mode is intended to avoid unintentional overwriting of the
memory. The write protection can be removed temporarily by executing a specific sequence
in the user software.
Protection of user boot code (UBC)
If the user chooses to update the Flash program memory using a specific boot code to
perform in application programming (IAP), this boot code needs to be protected against
unwanted modification.
In the STM8A a memory area of up to 128 Kbytes can be protected from overwriting at user
option level. Other than the standard write protection, the UBC protection can exclusively be
modified via the debug interface, the user software cannot modify the UBC protection
status.
The UBC memory area contains the reset and interrupt vectors and its size can be adjusted
in increments of 512 bytes by programming the UBC and NUBC option bytes
(see Section 9: Option bytes on page 54).
Figure 2. Flash memory organization of STM8A products
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5.4.4
06 9
Read-out protection (ROP)
The STM8A provides a read-out protection of the code and data memory which can be
activated by an option byte setting (see the ROP option byte in section 10).
The read-out protection prevents reading and writing Flash program memory, data memory
and option bytes via the debug module and SWIM interface. This protection is active in all
device operation modes. Any attempt to remove the protection by overwriting the ROP
option byte triggers a global erase of the program and data memory.
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