Information

UARTx_MODEM field descriptions (continued)
Field Description
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.
48.3.15 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.
1–0
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 48 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
1297
General Business Information