5.5.1.5 User Configuration Fuse

The bit field values of this fuse are written to the corresponding bit fields of the User Configuration register (SYSCTRL.USERCFG) in the System Controller and the Multivoltage I/O register (SUPC.MVIO) in the Supply Controller at start-up. The default value given in this fuse description is the factory-programmed value and must not be mistaken for the Reset value.
Name: USERCFG
Offset: 0x0020
Reset: 0xFFFFFFFF
Property: R/W

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
      SUT[2:0] 
Access R/WR/WR/W 
Reset 111 
Bit 76543210 
 CRCBOOTCRCSEL     MVIOMODE 
Access R/WR/WR/W 
Reset 111 

Bits 10:8 – SUT[2:0] Start-up Time

This bit field value is loaded into the SUT bit field in the USERCFG register of the System Controller (SYSCTRL.USERCFG) during Reset. Refer to the SYSCTRL - System Controller section for further details.
ValueNameDescription
0x0 0MS 0 ms
0x1 1MS 1 ms
0x2 2MS 2 ms
0x3 4MS 4 ms
0x4 8MS 8 ms
0x5 16MS 16 ms
0x6 32MS 32 ms
0x7 64MS 64 ms

Bit 7 – CRCBOOT CRC Boot

This bit value is loaded into the CRCBOOT bit in the USERCFG register of the System Controller (SYSCTRL.USERCFG) during Reset. Refer to the SYSCTRL - System Controller section for further details.
ValueNameDescription
0 DISABLE No CRC
1 ENABLE CRC of the Boot section

Bit 6 – CRCSEL CRC Polynomial Selection

This bit value is loaded into the CRCSEL bit in the USERCFG register of the System Controller (SYSCTRL.USERCFG) during Reset. Refer to the SYSCTRL - System Controller section for further details.
ValueNameDescription
0 CRC16 CRC-16-CCITT
1 CRC32 CRC-32 (IEEE 802.3)

Bit 0 – MVIOMODE MVIO Operation Mode

This bit value is loaded into the MODE bit in the MVIO register of the Supply Controller (SUPC.MVIO) during Reset. Refer to the SUPC - Supply Controller section for further details.
ValueNameDescription
0 DUAL MVIO operating in dual supply mode
1 SINGLE MVIO operating in single supply mode