H Bridge Motor control :

Fig:Motor driving circuit and Data Table for Motor

VccSometimes the rotation direction needs to be changed. In normal permanent magnet motors, this rotation is changed by changing the polarity of operating power (for example by switching from negative power supply to positive or by interchanging the power terminals going to power supply).

The TTL output from the electronic interface is not able to drive the motor. Hence this direction changing is typically implemented using relay or a circuit called an H bridge

For the motor to run in one direction one terminal of the motor should get supply and the other is grounded .if the condition is reversed motor will run in the opposite direction. Hence we have provided two data bits for each motor ;10 for clockwise direction and 01 for anti-clockwise direction of motion.