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CP3SP33SMS/NOPB Datasheet(PDF) 198 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 198 Page - Texas Instruments |
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198 / 407 page  CP3SP33 SNOSCW5 – MAY 2013 www.ti.com RTR The Remote Transmission Request bit indicates 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 for the 11 standard frame identifier bits. Table 22-10. Standard Frame with 8 Data Bytes Buffer Address 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Register BASE + 00h CNSTAT DLC Reserved PRI ST BASE + 04h TSTP TSTP[15:0] BASE + 08h DATA3 Data7[7:0] Data8[7:0] BASE + 0Ch DATA2 Data5[7:0] Data6[7:0] BASE + 10h DATA1 Data3[7:0] Data4[7:0] BASE + 14h DATA0 Data1[7:0] Data2[7:0] BASE + 18h ID0 Don't Care BASE + 1Ch ID1 ID[10:0] RTR IDE Don't Care 22.10.3 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 within these bytes will be overwritten with invalid data. 22.10.4 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 22-11. The SRR bit is at the bit position of the RTR bit for standard frame and needs to be transmitted as 1. Table 22-11. Extended Messages with 8 Data Bytes Buffer Address 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Register BASE + 00h CNSTAT DLC Reserved PRI ST BASE + 04h TSTP TSTP BASE + 08h DATA3 Don't Care BASE + 0Ch DATA2 BASE + 10h DATA1 BASE + 14h DATA0 BASE + 18h ID0 ID[14:0] RTR BASE + 1Ch ID1 ID[28:18] SRR IDE ID17:15] 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 software. IDE The Identifier Extension bit determines whether the message is a standard frame or an extended frame. 0 – Message is a standard frame using 11 identifier bits. 1 – Message is an extended frame. RTR The Remote Transmission Request bit indicates whether the message is a data frame or a remote frame. 0 – Message is a data frame. 1 – Message is a remote frame. 198 Dual CAN Interfaces Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links :CP3SP33 |
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