Rainbow Electronics ATmega128RFA1 - Manual (Page 434)

434
8266A-MCU Wireless-12/09
ATmega128RFA1
• Bit 6:3 – BGCAL_FINE3:0 - Fine Calibration Bits
These bits allow the calibration of the AREF voltage with a resolution of 2mV.
Table 27-14 BGCAL_FINE Register Bits
Register Bits Value Description
0 Center value
1 Voltage step up
8 Voltage step down
7 Setting for highest voltage
BGCAL_FINE3:0
15 Setting for lowest voltage
• Bit 2:0 – BGCAL2:0 - Coarse Calibration Bits
These bits allow the calibration of the AREF voltage with a resolution of 10mV.
Table 27-15 BGCAL Register Bits
Register Bits Value Description
4 Center value
3 Voltage step up
5 Voltage step down
0 Setting for highest voltage
BGCAL2:0
7 Setting for lowest voltage