PWM control circuit, microcomputer and electronic equipment
US7017069B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2003 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Mar 20, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.