In the datasheet, Register 0 has 5 bits (P0-P4) that are defined as "This bits control position of motor, e.g. 00000 step angle is 0, 01111 step angle is 180. There is no table which defines how to derive the other angles. Are these bits incremented each time STEP is switched? What are the purpose of these bits? I will be full-stepping the motor in all circumstances. It is a 20 step/revolution motor.