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AT89C51CC02CA-RATUM 数据表(PDF) 104 Page - ATMEL Corporation |
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AT89C51CC02CA-RATUM 数据表(HTML) 104 Page - ATMEL Corporation |
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104 / 156 page  104 AT/T89C51CC02 4126J–CAN–05/06 Table 70. CANSTCH Register CANSTCH (S:B2h) – CAN Message Object Status Register Note: See Figure 39. No default value after reset. 76 54 32 1 0 DLCW TXOK RXOK BERR SERR CERR FERR AERR Bit Number Bit Mnemonic Description 7DLCW Data Length Code Warning The incoming message does not have the DLC expected. Whatever the frame type, the DLC field of the CANCONCH register is updated by the received DLC. 6TXOK Transmit OK The communication enabled by transmission is completed. When the controller is ready to send a frame, if two or more message objects are enabled as producers, the lower index message object (0 to 13) is supplied first. Must be cleared by software. This flag can generate an interrupt. 5RXOK Receive OK The communication enabled by reception is completed. In the case of two or more message object reception hits, the lower index message object (0 to 13) is updated first. Must be cleared by software. This flag can generate an interrupt. 4BERR bit Error (only in transmission) The bit value monitored is different from the bit value sent. Exceptions: the monitored recessive bit sent as a dominant bit during the arbitration field and the acknowledge slot detecting a dominant bit during the sending of an error frame. Must be cleared by software. This flag can generate an interrupt. 3SERR Stuff Error Detection of more than five consecutive bits with the same polarity. Must be cleared by software. This flag can generate an interrupt. 2CERR CRC Error The receiver performs a CRC check on each destuffed received message from the start of frame up to the data field. If this checking does not match with the destuffed CRC field, a CRC error is set. Must be cleared by software. This flag can generate an interrupt. 1FERR Form Error The form error results from one or more violations of the fixed form in the following bit fields: CRC delimiter acknowledgment delimiter end_of_frame Must be cleared by software. This flag can generate an interrupt. 0AERR Acknowledgment Error No detection of the dominant bit in the acknowledge slot. Must be cleared by software. This flag can generate an interrupt. |
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