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我看datasheet的471页是这样描述的:
REFSEL
Voltage Reference Selection
Selects the voltage reference source used for conversions.
00 Default voltage reference pin pair, that is, external pins VREFH and VREF
01 Alternate reference pair, that is, VALTH and VALTL . This pair may be additional external pins or
internal sources depending on the MCU configuration. See the chip configuration information for
details specific to this MCU
当REFSEL设置为01时可以是外部引脚或者内部参考源?怎么样才可以设置成内部参考电压?
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