UARTx_C2 field descriptions (continued)
Field
Description
3
TE
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.
2
RE
Receiver Enable
RE enables the UART receiver.
0
Receiver off.
1
Receiver on.
1
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.
0
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
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
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1440
Freescale Semiconductor, Inc.
Содержание K53 Series
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