When TCR4[FCONT] is set, the FIFO will continue transmitting data following an
underflow without software intervention. To ensure that data is transmitted in the correct
order, the transmitter will continue from the same word number in the frame that caused
the FIFO to underflow, but only after new data has been written to the transmit FIFO.
Software should still clear the TCSR[FEF] flag, but without reinitializing the transmit
FIFOs.
RCSR[FEF] is set when the any of the enabled receive FIFOs overflow. After it is set, all
enabled receive channels discard received data until RCSR[FEF] is cleared and the next
next receive frame starts. All enabled receive FIFOs should be emptied before
RCSR[FEF] is cleared.
When RCR4[FCONT] is set, the FIFO will continue receiving data following an
overflow without software intervention. To ensure that data is received in the correct
order, the receiver will continue from the same word number in the frame that caused the
FIFO to overflow, but only after data has been read from the receive FIFO. Software
should still clear the RCSR[FEF] flag, but without emptying the receive FIFOs.
The FIFO error flag can generate only an interrupt.
40.5.7.3 Sync error flag
The sync error flag, TCSR[SEF] or RCSR[SEF], is set when configured for an externally
generated frame sync and the external frame sync asserts when the transmitter or receiver
is busy with the previous frame. The external frame sync assertion is ignored and the
sync error flag is set. When the sync error flag is set, the transmitter or receiver continues
checking for frame sync assertion when idle or at the end of each frame.
The sync error flag can generate an interrupt only.
40.5.7.4 Word start flag
The word start flag is set at the start of the second bit clock for the selected word, as
configured by the Word Flag register field.
The word start flag can generate an interrupt only.
Functional description
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
820
Freescale Semiconductor, Inc.
