38.9.1.3 TXQ Status Flags

There are two TXQ status flags:
  • TXQEIF: TXQ Empty Interrupt Flag; set when the TXQ is empty.
  • TXQNIF: TXQ Not Full Interrupt Flag; set when TXQ is not full.

The status flags of the TXQ are set when there is space to load a new message object into the TXQ. Before the first message object is loaded (after the TXQ is reset), all status flags are set. When the TXQ is fully loaded, all flags are cleared.