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AN1105 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN1105 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 100 page  7/100 ST7 pCAN PERIPHERAL DRIVER –A RTR bit used to differentiate data and remote frames. It is dominant in a data frame. s A 6-bit control field, including: – A 4-bit data length code bits giving the size (in bytes) of the data field –1 IDentifier Extension (IDE) bit (dominant for CAN 2.0A frame) and 1 bit reserved for fur- ther development. s A data field of up to 8 bytes. s A 16-bit long CRC field. The Cyclic Redundancy Check (CRC) is based on a BCH encoding. s A 2-bit acknowledgment field. The transmitters sends it as all recessive. (See “Message Acknowledgement” on page 11) s A 7-bit end-of-frame field. The interframe space (or Intermission) is the minimum amount of time between two consecu- tive transmissions. Figure 2. CAN Data Frame 1.2.2 CAN Remote Frame The CAN Remote frame is used to request data. This frame has the same overall constitution as the data frame. However, in this case, the Remote bit (RTR) is recessive and there is no data field. 19 bits 25 bits 11-bit Identifier DLC 15 bits Bus Idle 3 bits 7 bits EOF ACK CRC Field Control Field Arbitration Field D R SOF RTR = 0 IDE = 0 ACK Delimiter ACK Slot CRC Delimiter Interframe Space Data Field Data 0..64 bits |
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