Datasheet

82
AT32UC3A
13.6.12 RC Oscillator Calibration
Register name RCCR
Register access Read/Write
• CALIB: Calibration Value
Calibration Value for the RC oscillator.
• FCD: Flash Calibration Done
Set to 1 when CTRL, HYST, and LEVEL fields have been updated by the Flash fuses after power-on reset, or after Flash fuses
are reprogrammed. The CTRL, HYST and LEVEL values will not be updated again by the Flash fuses until a new power-on
reset or the FCD field is written to zero.
• KEY: Register Write protection
This field must be written twice, first with key value 0x55, then 0xAA, for a write operation to have an effect.
31 30 29 28 27 26 25 24
KEY
23 22 21 20 19 18 17 16
- - - - - - - FCD
15 14 13 12 11 10 9 8
- - - - - - CALIB
7 6 5 4 3 2 1 0
CALIB
32058K
AVR32-01/12