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31.2.7 LPUART Control Register (LPUARTx_CTRL)
This read/write register controls various optional features of the LPUART system. This
register should only be altered when the transmitter and receiver are both disabled.
Address: Base a 18h offset
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
LPUARTx_CTRL field descriptions
Field
Description
31
R8T9
Receive Bit 8 / Transmit Bit 9
R8 is the ninth data bit received when the LPUART is configured for 9-bit or 10-bit data formats. When
reading 9-bit or 10-bit data, read R8 before reading LPUART_DATA.
T9 is the tenth data bit received when the LPUART is configured for 10-bit data formats. When writing 10-
bit data, write T9 before writing LPUART_DATA. If T9 does not need to change from its previous value,
such as when it is used to generate address mark or parity, they it need not be written each time
LPUART_DATA is written.
30
R9T8
Receive Bit 9 / Transmit Bit 8
R9 is the tenth data bit received when the LPUART is configured for 10-bit data formats. When reading
10-bit data, read R9 before reading LPUART_DATA
T8 is the ninth data bit received when the LPUART is configured for 9-bit or 10-bit data formats. When
writing 9-bit or 10-bit data, write T8 before writing LPUART_DATA. If T8 does not need to change from its
previous value, such as when it is used to generate address mark or parity, they it need not be written
each time LPUART_DATA is written.
29
TXDIR
LPUART_TX Pin Direction in Single-Wire Mode
When the LPUART is configured for single-wire half-duplex operation (LOOPS = RSRC = 1), this bit
determines the direction of data at the LPUART_TX pin. When clearing TXDIR, the transmitter will finish
receiving the current character (if any) before the receiver starts receiving data from the LPUART_TX pin.
0
LPUART_TX pin is an input in single-wire mode.
1
LPUART_TX pin is an output in single-wire mode.
Table continues on the next page...
Register definition
K32 L2A Reference Manual, Rev. 2, 01/2020
822
NXP Semiconductors
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