ZHCSDA7G July 2014 – February 2018 DRV10983
Several of the registers such as MotorSpeed report data that is contained in two registers.
To make sure that the data does not change between the reading of the first and second register reads, the DRV10983 implements a special scheme to synchronize the reading of MSB and LSB data. To ensure valid data is read when reading a two register value, use the following sequence.
Figure 38 shows the two-register readback circuit. When the MSB is read, the controller takes a snapshot of the LSB. The LSB data is stored in one extra register byte, which is shown as MotorSpeedBuffer[7:0]. When the LSB is read, the value of MotorSpeedBuffer[7:0] is sent.