Table 46-2. Break character length
BRK13
M
M10
M7
SBNS
Break character
length
0
0
0
0
0
10 bit times
0
0
0
0
1
11 bit times
0
0
0
1
0
9 bit times
0
0
0
1
1
10 bit times
0
1
0
X
0
11 bit times
0
1
0
X
1
12 bit times
0
X
1
X
0
12 bit times
0
X
1
X
1
13 bit times
1
0
0
0
0
13 bit times
1
0
0
0
1
13 bit times
1
0
0
1
0
12 bit times
1
0
0
1
1
12 bit times
1
1
0
X
0
14 bit times
1
1
0
X
1
14 bit times
1
X
1
X
0
15 bit times
1
X
1
X
1
15 bit times
46.4.2.2 Hardware flow control
The transmitter supports hardware flow control by gating the transmission with the value
of CTS_B. If the clear-to-send operation is enabled, the character is transmitted when
CTS_B is asserted. If CTS_B is deasserted in the middle of a transmission with
characters remaining in the receiver data buffer, the character in the shift register is sent
and TXD remains in the mark state until CTS_B is reasserted.
If the clear-to-send operation is disabled, the transmitter ignores the state of CTS_B.
The transmitter's CTS_B signal can also be enabled even if the same LPUART receiver's
RTS_B signal is disabled.
46.4.2.3 Transceiver driver enable
The transmitter can use RTS_B as an enable signal for the driver of an external
transceiver. See
Transceiver driver enable using RTS_B
for details. If the request-to-send
operation is enabled, when a character is placed into an empty transmitter data buffer,
RTS_B asserts one bit time before the start bit is transmitted. RTS_B remains asserted for
the whole time that the transmitter data buffer has any characters. RTS_B deasserts one
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
1208
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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