UARTx_MODEM field descriptions (continued)
Field Description
0 The transmitter has no effect on RTS.
1 When a character is placed into an empty transmitter data buffer , RTS asserts one bit time before the
start bit is transmitted. RTS deasserts one bit time after all characters in the transmitter data buffer
and shift register are completely sent, including the last stop bit. (FIFO)
NOTE:
Ensure that C2[TE] is asserted before assertion of this bit.
0
TXCTSE
Transmitter clear-to-send enable
TXCTSE controls the operation of the transmitter. TXCTSE can be set independently from the state of
TXRTSE and RXRTSE.
0 CTS has no effect on the transmitter.
1 Enables clear-to-send operation. The transmitter checks the state of CTS each time it is ready to send
a character. If CTS is asserted, the character is sent. If CTS is deasserted, the signal TXD remains in
the mark state and transmission is delayed until CTS is asserted. Changes in CTS as a character is
being sent do not affect its transmission.
47.3.15 UART Infrared Register (UARTx_IR)
The IR register controls options for setting the infrared configuration.
Address:
Base address + Eh offset
Bit 7 6 5 4 3 2 1 0
Read 0
IREN TNP
Write
Reset
0 0 0 0 0 0 0 0
UARTx_IR field descriptions
Field Description
7–3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
2
IREN
Infrared enable
Enables/disables the infrared modulation/demodulation.
0 IR disabled.
1 IR enabled.
TNP Transmitter narrow pulse
Enables whether the UART transmits a 1/16, 3/16, 1/32, or 1/4 narrow pulse.
00 3/16.
01 1/16.
10 1/32.
11 1/4.
Chapter 47 Universal Asynchronous Receiver/Transmitter (UART)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 1241
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