Receive frame status. Can only be written when RM in CANMOD is 1.
| IDINDEX | ID Index. If the BP bit (below) is 0, this value is the zero-based number of the Lookup Table RAM entry at which the Acceptance Filter matched the received Identifier. Disabled entries in the Standard tables are included in this numbering, but will not be matched. See Section 21.17 Examples of acceptance filter tables and ID index values on page 587 for examples of ID Index values. |
| BP | If this bit is 1, the current message was received in AF Bypass mode, and the ID Index field (above) is meaningless. |
| RESERVED | Reserved. The value read from a reserved bit is not defined. |
| DLC | The field contains the Data Length Code (DLC) field of the current received message. When RTR = 0, this is related to the number of data bytes available in the CANRDA and CANRDB registers as follows: 0000-0111 = 0 to 7 bytes1000-1111 = 8 bytes With RTR = 1, this value indicates the number of data bytes requested to be sent back, with the same encoding. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| RTR | This bit contains the Remote Transmission Request bit of the current received message. 0 indicates a Data Frame, in which (if DLC is non-zero) data can be read from the CANRDA and possibly the CANRDB registers. 1 indicates a Remote frame, in which case the DLC value identifies the number of data bytes requested to be sent using the same Identifier. |
| FF | A 0 in this bit indicates that the current received message included an 11-bit Identifier, while a 1 indicates a 29-bit Identifier. This affects the contents of the CANid register described below. |