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5962-03A0601VXC Datasheet(PDF) 6 Page - ATMEL Corporation |
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5962-03A0601VXC Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 50 page  6 AT7908E 4268D–AERO–11/09 Functional Description The AT7908E is an integrated device that performs serial communications according to the CAN protocol. The CAN protocol uses a multi-master bus configuration to transfer data packets between nodes on a network. It supports both, standard and extended, message frame formats as CAN Specification 2.0B. It can transmit and receive with 29 identifier bits and it can filter the first eleven bits of the receiving message (the filtering function is performed only on eleven bits). The AT7908E has one transmit buffer and three receiving buffers. The filtering function is individual for every RX message buffer. Every RX message buffer is formed by an identifier (29 bits long), by the data and by the status register that store the status of the receiver buffer. The identifier permits to filter the receiving message together with the global mask that implements the don’t care condition. A message is accepted and stored in the RX message buffer only if the identifier of the incoming message (first eleven bits) matches the identifier in the RX message buffer. If the receiving message matches more than one identifier, the message is stored in the lowest numbered mes- sage buffer. The AT7908E implements a global acceptance-masking feature for the message filtering. The AT7908E was developed to have a programmable general-purpose MCU interface. The MCU interface permits to program the internal register of the AT7908E and to read out the status of the controller and the received messages. The schematic representa- tion of the AT7908E is shown in Fig. 1. Figure 1. Block Schematic of AT7908E To transmit a CAN message, the MCU must write in the interface internal registers the data and the configuration signals. The message bus (0 to 101) goes to can_tx that generates the output signal to the transceiver can_tx and the signals for crc_calculator and for error_counters. The crc_calculator block calculates the CRC on the received message and, if the CAN is in Transmission State, sends the CRC to can_tx. If the CAN is receiving the mes- sage, the CRC is sent to can_rx (CRC<0:14>) that checks if the calculated CRC matches the received CRC. CAN Transmitter can_tx CRC Calculator crc_calculator CAN Receiver can_rx Error Counters error counters Synchronizer Stuff Handler Error_frame_gen Mode sena test MCU INTERFACE CS WR RD ALE addr<7:0> data_add<7:0> XTALIN reset xtalout int cantx canrx hatrig hasync |
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