The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2005
Filed:
May. 09, 2003
Applicant:
Toshiki Takei, Okaya, JP;
Inventor:
Toshiki Takei, Okaya, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 1328 ; G06F 1500 ;
U.S. Cl.
CPC ...
Abstract
Control data is efficiently serially transferred to a drive device for driving a motor without involving the CPU. Data buffers are allocated at specific memory addresses. An address decoder decodes a memory address output to the address bus and applies a write enable signal to the corresponding data buffer to write data to that data buffer by DMA transfer. When data is written to a data buffer, a sequencer circuit compiles control data, based on data in that data buffers, in a shift register, and serially transfers the control data one bit at a time on a serial transfer line synchronized to a clock.