Semiconductor device and motor control system

A motor control system comprising:

• a controller;
• a semiconductor device;
• an inverter;
• and
• a motor,
• wherein the controller inputs instruction information related to an operation of the motor to the semiconductor device,
• wherein the semiconductor device includes a timer control circuit, and an AD converter that is connected to a sensor that obtains information related to the operation of motor, and generates a PWM control signal for controlling the motor by using a periodic signal in the timer control circuit based on the instruction information and an output of the AD converter,
• wherein the AD converter starts AD conversion in synchronization with a latest AD synchronization signal after receiving an AD conversion start request signal,
• wherein an output of the inverter is controlled based on the PWM control signal,
• wherein the motor is driven by an output of the inverter, and
• wherein the timer control circuit includes
• a phase-locked loop counter that starts counting in association with activation of the semiconductor device, a timer phase register, and an AD synchronization phase register,
• executes
• processing of outputting a timer phase signal that is a basis for starting generation of the periodic signal and the AD conversion start request signal at a timing when a counter value of the phase-locked loop counter matches a setting value of the timer phase register, and
• processing of outputting an AD synchronization phase signal that is a basis for starting generation of the AD synchronization signal at a timing when the counter value of the phase-locked loop counter matches a setting value of the AD synchronization phase register, and
• performs control so that a phase difference between the AD conversion start request signal and the AD synchronization signal is constant regardless of a timing of the activation of the semiconductor device.