Datasheet

17.8.16 Voltage References System (VREF) Control
Name: VREF
Offset: 0x40
Reset: 0x0XXX0000
Property: Write-Protected
Bit 31 30 29 28 27 26 25 24
CALIB[10:8]
Access
R/W R/W R/W
Reset x x x
Bit 23 22 21 20 19 18 17 16
CALIB[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset x x x x x x x x
Bit 15 14 13 12 11 10 9 8
Access
Reset
Bit 7 6 5 4 3 2 1 0
BGOUTEN TSEN
Access
R/W R/W
Reset 0 0
Bits 26:16 – CALIB[10:0] Bandgap Voltage Generator Calibration
These bits are used to calibrate the output level of the bandgap voltage reference. These bits are loaded
from Flash Calibration Row at startup.
Bit 2 – BGOUTEN Bandgap Output Enable
Value Description
0
The bandgap output is not available as an ADC input channel.
1
The bandgap output is routed to an ADC input channel.
Bit 1 – TSEN Temperature Sensor Enable
Value Description
0
Temperature sensor is disabled.
1
Temperature sensor is enabled and routed to an ADC input channel.
SAM D21 Family
SYSCTRL – System Controller
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 231