Title:
PWM CONTROL CIRCUIT, MICROCOMPUTER AND ELECTRONIC DEVICE
Document Type and Number:
Japanese Patent JP3817958
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a PWM control circuit that can generate a PWM signal high in resolution with a small circuit scale and to obtain a microcomputer and an electronic device.
SOLUTION: This PWM control circuit is provided with a PWM period setting register 10, a connector 12, an edge point setting register 14, a PWM output circuit 20 that changes a level of a PWM signal at a 1st edge point, and a delay setting register 16 that is provided additionally to a lower-order digit point of the edge point setting register 14 to specify a delay time off the 1st edge point. The PWM output circuit 20 delays the 1st edge point by a period shorter than one clock period of a CLK in response to a setting value of the delay setting register 16. Thus, the resolution of the PWM signal can be enhanced. A setting value in one or two bits is stored to the delay setting register 16, the 1st edge point is delayed by a half clock period in response to this setting value or the 1st edge point is delayed by 1/4, 2/4, or 3/4 clock period.
Inventors:
Makoto Kudo
Katsuya Iida
Katsuya Iida
Application Number:
JP6970999A
Publication Date:
September 06, 2006
Filing Date:
March 16, 1999
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
H03M1/82; G06F1/04; G06F11/22; G06F11/28; H02M1/08; H02M7/48; H03K3/017; H03M5/08; H04L25/49; (IPC1-7): H03M1/82; H02M1/08; H03M5/08; H04L25/49; //H02M7/48
Domestic Patent References:
| JP3131125A |
Attorney, Agent or Firm:
Takekoshi Noboru
Enami Tomokazu
Yasushi Kuroda
Inoue Ichi
Yukio Fuse
Mitsue Obuchi
Enami Tomokazu
Yasushi Kuroda
Inoue Ichi
Yukio Fuse
Mitsue Obuchi
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