I'm trying to understand the registers of the ADAR7251 that control the highpass filter and its cutoff frequency.
According to the datasheet theory of operation, the HPF cutoff frequency is controlled via register 0x301. There is no description of what register 0x141, the High Pass Filter Control Register, does. The datasheet shows PHASE_EQ, HP_SHIFT, and ENABLE_HP sub-fields for this register.
What is the function of these fields of register 0x141 and how do they relate to the EQ_CAP_CTRL field in register 0x301?