Electrical computers and digital data processing systems: input/ – Input/output data processing – Direct memory accessing
Reexamination Certificate
2004-03-25
2009-12-08
Fleming, Fritz (Department: 2181)
Electrical computers and digital data processing systems: input/
Input/output data processing
Direct memory accessing
C710S023000, C710S024000, C710S025000, C710S026000, C710S027000, C710S028000, C710S048000, C710S049000, C710S050000, C710S052000, C710S057000, C710S060000, C710S260000, C710S261000, C710S262000
Reexamination Certificate
active
07631114
ABSTRACT:
The serial communication device capable of reducing the load on the CPU is provided for a system using the serial communications such as the car navigation system. The attention is focused on the control method of the serial communication, in which a DMA controller is used for the data reception in the serial communication, and a number larger than the number of data received at a time is set in advance as the number of transfers of the receive DMA controller, and further, the function to generate the timeout interrupt when data is not received for a certain period is added to the serial interface, so that the serial communication can be controlled and performed without applying the load on the CPU.
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Kamada Kenji
Onodera Yoichi
Suzuki Yasumasa
Alpine Electronics Inc.
Fleming Fritz
Lee Chun-Kuan
Miles & Stockbridge P.C.
Renesas Technology Corp.
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