8.8.2.4 System Configuration 0
The default value given in this fuse description is the factory-programmed value and must not be mistaken for the Reset value.
| Name: | SYSCFG0 |
| Offset: | 0x05 |
| Reset: | 0xD0 |
| Property: | - |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CRCSRC[1:0] | CRCSEL | UPDIPINCFG | RSTPINCFG | EESAVE | |||||
| Access | R | R | R | R | R | R | |||
| Reset | 1 | 1 | 0 | 1 | 0 | 0 | |||
Bits 7:6 – CRCSRC[1:0] CRC Source
| Value | Name | Description |
|---|---|---|
| 0x0 | FLASH | CRC of full Flash (boot, application code, and application data) |
| 0x1 | BOOT | CRC of the Boot section |
| 0x2 | BOOTAPP | CRC of the Application code and Boot sections |
| 0x3 | NOCRC | No CRC |
Bit 5 – CRCSEL CRC Mode Selection
| Value | Name | Description |
|---|---|---|
| 0 | CRC16 | CRC-16-CCITT |
| 1 | CRC32 | CRC-32 (IEEE 802.3) |
Bit 4 – UPDIPINCFG Configuration of UPDI Pin at Start-Up
| Value | Name | Description |
|---|---|---|
| 0 | GPIO | UPDI pin is configured as GPIO |
| 1 | UPDI | UPDI pin is configured as UPDI pin with pull-up enabled on PF7. This is the factory default value |
Bit 3 – RSTPINCFG Reset Pin Configuration at Start-Up
| Value | Name | Description |
|---|---|---|
| 0 | INPUT | PF6 is configured as a general input pin. This is the factory default value. |
| 1 | RESET | External Reset enabled on PF6 |
Bit 0 – EESAVE EEPROM Save During Chip Erase
| Value | Name | Description |
|---|---|---|
| 0 | DISABLE | EEPROM is erased during chip erase |
| 1 | ENABLE | EEPROM is preserved during a chip erase regardless of whether the device is locked or not |