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CP3SP33SMS/NOPB Datasheet(PDF) 197 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 197 Page - Texas Instruments |
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197 / 407 page  CP3SP33 www.ti.com SNOSCW5 – MAY 2013 Table 22-8. Buffer Status Section of the CNSTAT Register (continued) ST3 ST0 ST2 ST1 BUFFER STATUS (DIR) (BUSY) 1 0 0 0 TX_NOT_ACTIVE 1 0 0 1 Reserved for TX_BUSY. (This state indicates that software wrote TX_NOT_ACTIVE to a transmit buffer which is scheduled for transmission or is currently transmitting.) 1 1 0 0 TX_ONCE 1 1 0 1 TX_BUSY0 (Indicates that a buffer is scheduled for transmission or is actively transmitting; it can be due to one of two cases: a message is pending for transmission or is currently transmitting, or an automated answer is pending for transmission or is currently transmitting.) 1 0 1 0 TX_RTR (Automatic response to a remote frame.) 1 0 1 1 Reserved for TX_BUSY1. (This condition does not occur.) 1 1 1 0 TX_ONCE_RTR (Changes to TX_RTR after transmission.) 1 1 1 1 TX_BUSY2 (Indicates that a buffer is scheduled for transmission or is actively transmitting; it can be due to one of two cases: a message is pending for transmission or is currently transmitting, or an automated answer is pending for transmission or is currently transmitting.) PRI The Transmit Priority Code field holds the software-defined transmit priority code for the message buffer. DLC The Data Length Code field determines the number of data bytes within a received/transmitted frame. For transmission, these bits need to be set according to the number of data bytes to be transmitted. For reception, these bits indicate the number of valid received data bytes available in the message buffer. Table 22-9 shows the possible bit combinations for DLC3:0 for data lengths from 0 to 8 bytes. Table 22-9. Data Length Coding DLC Number of Data Bytes(1) 0000 0 0001 1 0010 2 0011 3 0100 4 0101 5 0110 6 0111 7 1000 8 (1) The maximum number of data bytes received/transmitted is 8, even if the DLC field is set to a value greater than 8. Therefore, if the data length code is greater or equal to eight bytes, the DLC field is ignored. 22.10.2 Storage of Standard Messages During the processing of standard frames, the Extended-Identifier (IDE) bit is clear. The ID1[3:0] and ID0[15:0] bits are “don’t care” bits. A standard frame with eight data bytes is shown in Table 22-10. 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. Copyright © 2013, Texas Instruments Incorporated Dual CAN Interfaces 197 Submit Documentation Feedback Product Folder Links :CP3SP33 |
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