PWM control circuit, microcomputer and electronic equipment

Details PWM control circuit, microcomputer and electronic equipment PWM control circuit, microcomputer and electronic equipment

2006-03-21

2006-03-21

Browne, Lynne H. (Department: 2116)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

C713S503000, C332S106000, C332S109000

Reexamination Certificate

active

07017069

ABSTRACT:
A PWM control circuit, microcomputer and electronic equipment which can generate high-resolution PWM signals through a small-sized scale of circuit. The PWM control circuit includes a PWM period value setting register, a counter, an edge-point value setting register, a PWM output circuit for varying the level of the PWM signal at a first edge-point, and a delay value setting register provided on low order side of the edge-point value setting register, for specifying a delay time of the first edge-point. The PWM output circuit delays the first edge-point by a period smaller than one clock period of CLK, in accordance with the value in the delay value setting register. This can improve the resolution of the PWM signal. One-bit or two-bit value is stored in the delay value setting register. Based on the stored value, the first edge-point can be delayed by ½, ¼, 2/4 or ¾ clock period.

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Ronald J. Tocci, “Digital Systems Principles and Applications”, 1980, Prentice Hall, p. 330.

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