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CP3BT13 Datasheet(PDF) 97 Page - National Semiconductor (TI) |
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CP3BT13 Datasheet(HTML) 97 Page - National Semiconductor (TI) |
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97 / 232 page  97 www.national.com 16.10.3 Storage of Messages with Less Than 8 Data Bytes The data bytes that are not used for data transfer are “don’t cares”. If the object is transmitted, the data within these bytes will be ignored. If the object is received, the data with- in these bytes will be overwritten with invalid data. 16.10.4 Storage of Extended Messages If the IDE bit is set, the buffer handles extended frames. The storage of the extended ID follows the descriptions in Table 45. The SRR bit is at the bit position of the RTR bit for standard frame and needs to be transmitted as 1. SRR The Substitute Remote Request bit replaces the RTR bit used in standard frames at this bit position. The SRR bit needs to be set by soft- ware if the buffer is configured to transmit a message with an extended identifier. It will be received as monitored on the CAN bus. IDE The Identifier Extension bit determines wheth- er the message is a standard frame or an ex- tended frame. 0 – Message is a standard frame using 11 identifier bits. 1 – Message is an extended frame. RTR The Remote Transmission Request bit indi- cates whether the message is a data frame or a remote frame. 0 – Message is a data frame. 1 – Message is a remote frame. ID The ID field is used to build the 29-bit identifier of an extended frame. Table 45 Extended Messages with 8 Data Bytes Address Buffer Register 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0E F0XEh ID1 ID[28:18] SRR IDE ID17:15] 0E F0XCh ID0 ID[14:0] RTR 0E F0XAh DATA0 Data1[7:0] Data2[7:0] 0E F0X8h DATA1 Data3[7:0] Data4[7:0] 0E F0X6h DATA2 Data5[7:0] Data6[7:0] 0E F0X4h DATA3 Data7[7:0] Data8[7:0] 0E F0X2h TSTP TSTP[15:0] 0E F0X0h CNSTAT DLC Reserved PRI ST |
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