Can controller and one-chip computer having a built-in can controller
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYasunori Shingaki
Life of this patent
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Abstract
A CAN controller is equipped with a control circuit that can control whether or not an edge detection signal of a serial signal (CRX input) that is detected by an edge detection circuit is to be input to a re-synchronization circuit causing the execution of a re-synchronizing function prepared in accordance with a CAN protocol. The re-synchronizing function can be made ineffective by inputting into a control signal the control circuit. As a result, the state of synchronization of the CRX input that occurs due to the re-synchronizing function ceases to fluctuate. Therefore, in the CAN controller, a test can be performed with a high speed and stably and without being influenced by the execution of the re-synchronizing function.
Claims3
A CAN controller comprising:
- an edge detection unit for detecting an edge of a serial signal that is input from a CAN (Controller Area Network) serial input terminal;
- a control unit for receiving an edge detection signal that is output from said edge detection unit and controlling according to an input of a control signal whether or not the edge detection signal that is input thereto is to be output therefrom;
- and
- a re-synchronization unit for causing a re-synchronizing function, prepared in accordance with a CAN protocol, to be executed according to an output signal from said control unit.
Dependencies are inferred from the claim text.