Datasheet

32117D–AVR-01/12

AT32UC3C

15.10.0.1 Oscillator Calibration (offset 0x0000)

• RC1M_CALIB_5V: Calibration of RC8M operating at 1MHz and at 5V

This calibration should be used when the RC8M is used at a frequency of 1 MHz and when the voltage of the VDDIN_5 pin is

within [4.5V:5.5V]. This value should be written to RCCR8.CALIB field of the SCIF module.

• RC8M_CALIB_5V: Calibration of RC8M operating at 8MHz and at 5V

This calibration should be used when the RC8M is used at a frequency of 8 MHz and when the voltage of the VDDIN_5 pin is

within [4.5V:5.5V]. This value should be written to RCCR8.CALIB.

• RC1M_CALIB: Calibration of RC8M operating at 1MHz and at 3.3V

This calibration should be used when the RC8M is used at a frequency of 1 MHz and when the voltage of the VDDIN_5 pin is

within [3.0V:3.6V]. This value should be written to RCCR8.CALIB.

• RC8M_CALIB: Calibration of RC8M operating at 8MHz and at 3.3V

This calibration should be used when the RC8M is used at a frequency of 8 MHz and when the voltage of the VDDIN_5 pin is

within [3.0V:3.6V]. This value is automatically loaded in RCCR8.CALIB at power-up.

Table 15-15. Oscillator Calibration

31 30 29 28 27 26 25 24

RC1M_CALIB_5V[7:0]

23 22 21 20 19 18 17 16

RC8M_CALIB_5V[7:0]

15 14 13 12 11 10 9 8

RC1M_CALIB[7:0]

76543210

RC8M_CALIB[7:0]