SECCTRL

Security Control

  0x34 32 PAC Write-Protection, Secure 'x' initially determined from NVM User Row after Reset  
Parent topic: Register Description

Security Control

Bit  31 30 29 28 27 26 25 24  
  KEY[7:0]  
Access  W/-/W W/-/W W/-/W W/-/W W/-/W W/-/W W/-/W W/-/W  
Reset  0 0 0 0 0 0 0 0  
Bit  23 22 21 20 19 18 17 16  
                   
Access                   
Reset                   
Bit  15 14 13 12 11 10 9 8  
            TEROW[2:0]  
Access            RW/-/RW RW/-/RW RW/-/RW  
Reset            0 0 0  
Bit  7 6 5 4 3 2 1 0  
    DXN     DSCEN SILACC   TAMPEEN  
Access    R/-/R     RW/-/RW RW/-/RW   RW/-/RW  
Reset    x     0 0   0  

Bits 31:24 – KEY[7:0]: Write Key

Write Key

When this bit group is written to the key value 0xA5, the write will be performed. If a value different from the key value is tried, the write will be discarded and INTFLAG.KEYE set.

Bits 10:8 – TEROW[2:0]: Tamper Erase Row

Tamper Erase Row

Row address of the row in data space to be erased on RTC tamper event.

Bit 6 – DXN: Data eXecute Never

Data eXecute Never

This bit field is only available for SAM L11 and has no effect for SAM L10.

This bit status is loaded from UROW at boot.

ValueDescription
0 Execution out of Data Flash is authorized.
1 Execution out of Data Flash is not authorized.

Bit 2 – SILACC: Silent Access

Silent Access

ValueDescription
0 Data in Tamper Erase Row is not mapped as differential data.
1 Data in Tamper Erase Row is mapped as differential data.

Bit 0 – TAMPEEN: Tamper Erase Enable

Tamper Erase Enable

ValueDescription
0 RTC tamper event has no effect.
1 RTC tamper event triggers a Tamper Erase.

Bit 3 – DSCEN: Data Scramble Enable

Data Scramble Enable

Important: This bitfield is only available for SAM L11 and has no effect for SAM L10.
ValueDescription
0 Secure Data FLASH is not scrambled.
1 Secure Data FLASH is scrambled.