AD7746 Coupling between two capacitance channels

Hey there, I am now using AD7746 for Capacitance sensing. I can now detect capacitance from each individual capacitance channel successfully, however, If I try to read capacitance from one channels after another, it seems to me that I got the same reading. i.e. the output from those two channels are the same.

I assume the most possible reason is that the registers storintg capacitance values is not cleared, so the same reading results are read out by those two channels.

Do you have any solution on this issue?

Thanks

Integrated/Special Purpose A/D Converters

ad7746

Capacitive-to-Digital and Touch Screen Controllers