SW4STM32C datasheet(47/99 Pages) STMICROELECTRONICS

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AN4989

Breaking and stepping into code

Thus, any attempt to load, or connect to, an application running from Flash crashes.

It is still possible to load, execute and debug an application in SRAM.

Option Bytes management can be done with ST-LINK utility or with an application

running from SRAM.

Going back to RDP Level 0 completely erases the Flash.

•

Level 2: No Debug.

JTAG/SWD connexion is killed. There is no way back. In this case, nobody - even

STMicroelectronics - can perform any analysis of defective parts.

5.3.2

PCROP

Proprietary Code ReadOut Protection is the ability to define secure area in Flash where user

can locate a proprietary code.

This prevents malicious software or debugger from reading sensitive code.

In case an application with third party code in PCROP area needs to be debugged, the

following points must be considered:

•

Step-into PCROP function is tolerated but ignored (Step-over)

•

Access to protected memory through debugger trigs Flash Interruption (Instrument

NMIHandler) and return default pattern for the whole area

For further details refer to section Memory Protection in the reference manual of the device.

Table 4. STM32 Series RDP protection extension

Product

RDP protection extension

+ backup registers

+ backup SRAM

+ backup registers

+ backup SRAM

+ EEPROM

+ backup registers

+ SRAM2

+ backup SRAM

SW4STM32C Datasheet(PDF) 47 Page - STMicroelectronics