Proprietary code read-out protection on STM32L4, STM32L4+, STM32G4 and STM32WB Series MCUs
■Software providers are developing complex middleware solutions known as IP (intellectual propriety) code, whose protection is a high importance issue for microcontrollers.
■To respond to this important requirement, STM32L4, STM32L4+, STM32G4 and STM32WB Series MCUs are provided with the following protection features:
▲Read-out protection (RDP): protection against read operations
▲Write protection: protection against undesired write or erase operations
▲Proprietary code read-out protection (PCROP): protection against read and write operations on Flash and SRAM memories.
▲Firewall: access protection to sensitive code and data against external processes.
■This application note provides a description of the Flash memory protection features, focusing on the PCROP technique, and providing a basic example of it. Firewall protection (available on STM32L4 and STM32L4+ Series) is described in AN4729 “STM32L0/L4 FIREWALL overview”, available on www.st.com).
■The X-CUBE-PCROP firmware package is delivered with this document. It contains the source code of the PCROP example with all firmware modules required to run the example based on STM32L4 Series microcontrollers, and easily portable to STM32L4+, STM32G4 and STM32WB Series microcontrollers.
■This application note must be read in conjunction with product datasheets and the following reference manuals, available on www.st.com:
▲RM0351 (STM32L4x5xx, STM32L4x6xx)
▲RM0392 (STM32L4x1xx)
▲RM0394 (STM32L43xxx, STM32L44xxx, STM32L45xxx, STM32L46xxx)
▲RM0432 (STM32L4Rxxx and STM32L4Sxxx)
▲RM0440 (STM32G4xx)
▲RM0434 (STM32WB55xx and STM32WB35xx)
▲RM0473 (STM32WB50CG and STM32WB30CE)
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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17-Nov-2020 |
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Rev 5 |
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AN4758 |
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1.4 MB |
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