Information

UARTx_C2 field descriptions (continued)

Field Description

Transmitter Enable

TE enables the UART transmitter.The TE bit can be used to queue an idle preamble by clearing and then

setting the TE bit. When 7816E is set/enabled and C7816[TTYPE] = 1, this bit is automatically cleared

after the requested block has been transmitted. This condition is detected when TL7816[TLEN] = 0 and

four additional characters have been transmitted.

0 Transmitter off.

1 Transmitter on.

Receiver Enable

RE enables the UART receiver.

0 Receiver off.

1 Receiver on.

RWU

Receiver Wakeup Control

This bit can be set to place the UART receiver in a standby state. RWU automatically clears when an

RWU event occurs (an IDLE event when C1[WAKE] is clear or an address match when C1[WAKE] is set).

This bit must be cleared when 7816E is set.

NOTE: RWU should only be set with C1[WAKE] = 0 (wakeup on idle) if the channel is currently not idle.

This can be determined by the S2[RAF] flag. If set to wake up an IDLE event and the channel is

already idle, it is possible that the UART will discard data since data must be received (or a LIN

break detect) after an IDLE is detected before IDLE is allowed to reasserted.

0 Normal operation.

1 RWU enables the wakeup function and inhibits further receiver interrupt requests. Normally, hardware

wakes the receiver by automatically clearing RWU.

SBK

Send Break

Toggling SBK sends one break character (10, 11, or 12 logic 0s, if S2[BRK13] is cleared; 13 or 14 logic

0s, if S2[BRK13] is set). See Transmitting break characters for the number of logic 0s for the different

configurations. Toggling implies clearing the SBK bit before the break character has finished transmitting.

As long as SBK is set, the transmitter continues to send complete break characters (10, 11, or 12 bits, or

13 or 14 bits).This bit must be cleared when 7816E is set.

0 Normal transmitter operation.

1 Queue break character(s) to be sent.

Memory map and registers

K10 Sub-Family Reference Manual, Rev. 6, Nov 2011

1266 Freescale Semiconductor, Inc.