SNIU028D February 2016 – September 2020 UCD3138 , UCD3138064 , UCD3138064A , UCD3138128 , UCD3138A , UCD3138A64
The FILTERKDALPHA register holds the two alpha coefficients which can be selected by the BINx_ALPHA bits in the COEFCONFIG register. Alpha is stored as a 9 bit signed number. Here is an example which only loads KD_ALPHA_0:
Filter1Regs.FILTERKDALPHA.bit.KD_ALPHA_0 = 134;