13.6.1 Control

Table 13-6. Register Bit Attribute Legend
SymbolDescriptionSymbolDescriptionSymbolDescription
R Readable bit HC Cleared by Hardware(Grey cell)Unimplemented
W Writable bit HS Set by Hardware X Bit is unknown at Reset
K Write to clear S Software settable bit
Name: CTRL
Offset: 0x00
Reset: 0x00
Property: Write-Protected

Bit 76543210 
    BKUPCLK     
Access R/W 
Reset 0 

Bit 4 – BKUPCLK Backup Clock Select

This bit is set by hardware when a clock failure is detected.

ValueDescription
0The GCLK_MAIN clock is selected for the main clock.
1The OSC8M backup clock is selected for the main clock.