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TAS6424LQ1EVM: Read the register 0x11 return 0x10 sometimes

Part Number: TAS6424LQ1EVM

I write the register 0x21 to 0x80 to clear fault, then read the register 0x11, sometimes it return 0x10.

May I know the reason and how to avoid it?

Regards

 

  {0x69u, WRITE,  0x01u,  0x00000000u,  0x01u,  0x00000021u,  0x01u,  0x0001u,  &Codec3TAS6424e_REG21_Data0[0], I2C},
  {0x69u, READ,  0x01u,  0x00000000u,  0x01u,  0x00000011u,  0x01u,  0x0001u,  &Codec3TAS6424e_REGRD_Data0[0], I2C},