PCM1863: In Active mode, I need to correctly know which channel currently has signal input

My question is when I use PCM1863 EVK with PCC2 software
The input signal I want to detect is input by R/L of VIN1
What I do in SLEEP mode is as follows:
1. Write Register 0x70 BIT 1 as 1 >>>Set the mode to SLEEP mode
2. Press "Refresh" on "Register" in the PCC2 operation interface
3. Check that the value of Register 0x32 is "0x03" >> That's right, because there is an input signal and bit0/1 must be 1 in SLEEP mode.
However
In Active mode I operate:
1. Write Register 0x70 BIT 1 as 0>>>Set the mode to Active mode
2. Press "Refresh" on "Register" in the PCC2 operation interface
3. Check that the value of Register 0x32 is "0x00" >> Error because there is an input signal in Active mode, bit0/1 should be 0, and the remaining bits should be 1 because there is no signal input.
So I should read that the value of Register 0x32 is "0xFC"
I also checked that it is not in "automatic clipping suppression mode"

What I want to ask is that in Active mode, I need to correctly know which channel currently has signal input. What should I do? Can you give me detailed steps and suggestions?

Thanks!!

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