28.3.1 Initialization
For a basic operation, follow these steps:
- Configure the desired input pins in the port peripheral
- Select the positive and negative input sources by writing the Positive and Negative Input MUX Selection (MUXPOS and MUXNEG) bit fields in the MUX Control A (ACn.MUXCTRLA) register
- Optional: Enable the output to pin by
writing a '
1' to the Output Pad Enable (OUTEN) bit in the Control A (ACn.CTRLA) register - Enable the AC by writing a
'
1' to the ENABLE bit in ACn.CTRLA
During the start-up time after enabling the AC, the output of the AC may be invalid.
The start-up time of the AC by itself is at most 2.5 µs. If an internal reference is used, the reference start-up time is normally longer than the AC start-up time.
To avoid the pin being tri-stated when the AC is disabled, the OUT pin must be configured as output in PORTx.DIR.