I'd like to output bit D6 from the TestBus which shows the actual received data stream. In order to this, I've set TestSel2Reg to 0x07 and TestSel1Reg to 0x05. This unfortunately does not work. Basically it does not matter what I write to TestSel1Reg, it is always the same. Also changing TestSel2Reg gives the same output. An image of this output is attached (this signal repeats a couple of times per second).