Cirrus Logic CRD48L10 - Manual (Page 17)

3
3.1 S1 Button Control (No LCD)
The MCU will cycle through the inputs when the button S1 is pressed from FLASH > LINE IN > MIC 1 & 2 > S/PDIF >
FLASH. LED locations are shown in
Fig. 3-4 to Fig. 3-6 .
If the MCU-USER-INTERFACE board is attached, the LCD also displays the active input.
Figure 3-4. LINE IN Active
Figure 3-5. MIC 1 & 2 Active