STM32G0C1NET6X datasheet(15/159 Pages) STMICROELECTRONICS

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DS13564 Rev 4

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STM32G0C1xC/xE

Functional overview

Flexible protections can be configured thanks to option bytes:

•

Readout protection (RDP) to protect the whole memory. Three levels are available:

–

Level 0: no readout protection

–

Level 1: memory readout protection: the Flash memory cannot be read from or

written to if either debug features are connected, boot in RAM or bootloader is

selected

–

Level 2: chip readout protection: debug features (Cortex-M0+ serial wire), boot in

RAM and bootloader selection are disabled. This selection is irreversible.

•

Write protection (WRP): the protected area is protected against erasing and

programming. Two areas per bank can be selected, with 2-Kbyte granularity.

•

Proprietary code readout protection (PCROP): a part of the Flash memory can be

protected against read and write from third parties. The protected area is execute-only:

it can only be reached by the STM32 CPU as instruction code, while all other accesses

(DMA, debug and CPU data read, write and erase) are strictly prohibited. An additional

option bit (PCROP_RDP) determines whether the PCROP area is erased or not when

the RDP protection is changed from Level 1 to Level 0.

The whole non-volatile memory embeds the error correction code (ECC) feature supporting:

•

single error detection and correction

•

double error detection

•

readout of the ECC fail address from the ECC register

3.3.1

Securable area

A part of the Flash memory can be hidden from the application once the code it contains is

executed. As soon as the write-once SEC_PROT bit is set, the securable memory cannot be

accessed until the system resets. The securable area generally contains the secure boot

code to execute only once at boot. This helps to isolate secret code from untrusted

application code.

Table 3. Access status versus readout protection level and execution modes

Area

Protection

level

User execution

Debug, boot from RAM or boot

from system memory (loader)

Read

Write

Erase

Read

Write

Erase

User

memory

Yes

N/A

System

memory

Yes

N/A

Option

bytes

Yes

N/A

Backup

registers

1Yes

Yes

N/A(1)

1. Erased upon RDP change from Level 1 to Level 0.

N/A(1)

Yes

N/A

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