M_CAN_TXFQS field descriptionsField Description0–9ReservedThis field is reserved.This read-only field is reserved and always has the value 0.10TFQFTx FIFO/Queue Full0 Tx FIFO/Queue not full1 Tx FIFO/Queue full11–15TFQPITx FIFO/Queue Put IndexTx FIFO/Queue write index pointer, range 0 to 31.16–18ReservedThis field is reserved.This read-only field is reserved and always has the value 0.19–23TFGITx FIFO Get IndexTx FIFO read index pointer, range 0 to 31. Read as zero when Tx Queue operation is configured(TXBC[TFQM] = 1).24–25ReservedThis field is reserved.This read-only field is reserved and always has the value 0.26–31TFFLTx FIFO Free LevelNumber of consecutive free Tx FIFO elements starting from TFGI, range 0 to 32. Read as zero when TxQueue operation is configured (TXBC[TFQM] = 1).3.3.35 Tx Buffer Element Size Configuration (M_CAN_TXESC)Configures the number of data bytes belonging to a Tx Buffer element. Data field sizes >8 bytes are intended for CAN FD operation only.Address: 0h base + C8h offset = C8hBit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31R 0 TBDSWReset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0M_CAN_TXESC field descriptionsField Description0–28ReservedThis field is reserved.This read-only field is reserved and always has the value 0.29–31TBDSTx Buffer Data Field SizeNOTE: In case the data length code DLC of a Tx Buffer element is configured to a value higher than theTx Buffer data field size TXESC[TBDS], the bytes not defined by the Tx Buffer are transmitted as0xCC (padding bytes).NOTE: This field has Protected Write status.Table continues on the next page...Chapter 3 Modular CAN (M_CAN)MPC5777C Reference Manual Addendum, Rev. 1, 12/2015Freescale Semiconductor, Inc. 71
