Patent ID: 6658583
Filing Date: 2003-12-02
Classification: G06F,H03K

Abstract:
A PWM (pulse width modulation) control circuit for generating a PWM signal, comprising:a counter for incrementing or decrementing a count value in accordance with a given operation clock; an edge-point value setting register for storing an edge-point value which specifies a first edge-point at which the level of the PWM signal varies; a PWM output circuit for varying the level of the PWM signal at said first edge-point specified by said edge-point value, based on said count value from said counter and said edge-point value from said edge-point value setting register; and a delay value setting register provided on low order side of said edge-point value setting register, for storing a delay value of a plurality of bits which specifies a delay time of said first edge-point, wherein said PWM output circuit delays said first edge-point by a period which is smaller than one-clock period of said operation clock, in accordance with said delay value stored in said delay value setting register.