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AFE2256: Can not find the register DF_SM[X].

Part Number: AFE2256

In the AFE2256 datasheet, there is a register called DF_SM[X] in page 34, but I can not find any information about this register. so I want to know how can I access this register.  And  is there any difference between photo-diode compensation and TFT compensation ? Thanks for you support.