NCP81223MNTXG refers to the master device that changes the wiring of the main circuit or the control circuit and changes the resistance value in the circuit according to a predetermined order to control the starting, speed regulation, braking, and reverse the direction of the motor. It consists of a program counter, an instruction register, an instruction decoder, a timing generator, and an operation controller. It is the "decision-making body" that issues commands, that is, to coordinate and direct the operation of the entire computer system.