Abstract: A PWM circuit of programmable subframe system includes a control circuit 20 for generating control signals Cm-CO according to the number of subframes, a PWM data register 60 for storing PWM data, a comparison/correction circuit 40 for determining the sequence of connections of the counter and then comparing the value of a counter 30 with the value of the register 60 to generator overflows under the control of the control signals and also simultaneously generate correction signals, a counter 30 for determining the seqence of connections by the circuit 40 and counting-up to return th e overflows to the circuit 40, a CMP OR Gate 70 for OR operating the correction signals generated in the circuit 40, a modulator 50 for setting and resetting the output and giving correction output.