Information

UARTx_C5 field descriptions (continued)
Field Description
0 If C2[TIE] is set and the S1[TDRE] flag is set, the TDRE interrupt request signal is asserted to request
interrupt service.
1 If C2[TIE] is set and the S1[TDRE] flag is set, the TDRE DMA request signal is asserted to request a
DMA transfer.
6
Reserved
This read-only field is reserved and always has the value zero.
5
RDMAS
Receiver Full DMA Select
Configures the receiver data register full flag, S1[RDRF], to generate interrupt or DMA requests if C2[RIE]
is set.
NOTE: If C2[RIE] is cleared, and S1[RDRF] is set, the RDRF DMA and RDFR interrupt request signals
are not asserted, regardless of the state of RDMAS.
0 If C2[RIE] and S1[RDRF] are set, the RDFR interrupt request signal is asserted to request an interrupt
service.
1 If C2[RIE] and S1[RDRF] are set, the RDRF DMA request signal is asserted to request a DMA
transfer.
4–0
Reserved
This read-only field is reserved and always has the value zero.
45.3.13 UART Extended Data Register (UARTx_ED)
This register contains additional information flags that are stored with a received
dataword. This register may be read at any time but contains valid data only if there is a
dataword in the receive FIFO.
NOTE
• The data contained in this register represents additional
information regarding the conditions on which a dataword
was received. The importance of this data varies with the
application, and in some cases maybe completely optional.
These fields automatically update to reflect the conditions
of the next dataword whenever D is read.
• If S1[NF] and S1[PF] have not been set since the last time
the receive buffer was empty, the NOISY and PARITYE
fields will be zero.
Chapter 45 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 1067