So, I assume that not compliant frame the main motivation of the problem! (That's why you can see initdata on doutx in mode2 operation, but the device cannot capture initdata).

Hi,In Mode2 configuration, L9663 Doutx pins output the Manchester-encoded voltage signal of the received sensor(s) data transmission. You should verify the MCU peripheral requirements (and configuration) for the connection details. 

Hi,INITDATA_RDY (SR3[2]) not set indicates that no valid init data were captured by the device (initdata buffer is empty).Did you check if your frame format is compliant with the initdata capture requirements? (20 bits payload: 3 bits Frame control b...