6.10.4.5 System Configuration 0

The default value given in this fuse description is the factory-programmed value and should not be mistaken for the Reset value.

Name: SYSCFG0
Offset: 0x05
Reset: 0xF6
Property: -

Bit 76543210 
 CRCSRC[1:0]  RSTPINCFG[1:0] EESAVE 
Access RRRRR 
Reset 11010 

Bits 7:6 – CRCSRC[1:0] CRC Source

This bit field controls which section of the Flash will be checked by the CRCSCAN peripheral during Reset initialization.
ValueNameDescription
0x0 FLASH CRC of full Flash (boot, application code and application data)
0x1 BOOT CRC of the boot section
0x2 BOOTAPP CRC of application code and boot sections
0x3 NOCRC No CRC

Bits 3:2 – RSTPINCFG[1:0] Reset Pin Configuration

This bit field selects the Reset/UPDI pin configuration.
Note: When configuring the RESET pin as GPIO, there is a potential conflict between the GPIO actively driving the output, and a high-voltage UPDI enable sequence initiation. To avoid this, the GPIO output driver is disabled for 768 OSC32K cycles after a System Reset. Enable any interrupts for this pin only after this period.
ValueDescription
0x0 GPIO
0x1 UPDI
0x2 RESET
Other Reserved

Bit 0 – EESAVE EEPROM Save During Chip Erase

Note: If the device is locked, the EEPROM is always erased by a chip erase, regardless of this bit.
ValueDescription
0 EEPROM erased during chip erase
1 EEPROM not erased under chip erase