UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
959 of 1269
NXP Semiconductors
UM10503
Chapter 37: LPC43xx USART0_2_3
37.6.7 USART Line Control Register
The LCR determines the format of the data character that is to be transmitted or received.
37.6.8 USART Line Status Register
The LSR is a Read Only register that provides status information on the USART TX and
RX blocks.
Table 830. USART Line Control Register (LCR - addresses 0x4008 100C (USART0), 0x400C
100C (USART2), 0x400C 200C (USART3)) bit description
Bit
Symbol Value Description
Reset
Value
1:0
WLS
Word Length Select.
0
0x0
5-bit character length.
0x1
6-bit character length.
0x2
7-bit character length.
0x3
8-bit character length.
2
SBS
Stop Bit Select.
0
0
1 stop bit.
1
2 stop bits (1.5 if LCR[1:0]=00).
3
PE
Parity Enable
0
0
Disable parity generation and checking.
1
Enable parity generation and checking.
5:4
PS
Parity Select.
0
0x0
Odd parity. Number of 1s in the transmitted character and the
attached parity bit will be odd.
0x1
Even Parity. Number of 1s in the transmitted character and the
attached parity bit will be even.
0x2
Forced "1" stick parity.
0x3
Forced "0" stick parity.
6
BC
Break Control.
0
0
Disable break transmission.
1
Enable break transmission. Output pin USART TXD is forced to
logic 0 when LCR[6] is active high.
7
DLAB
Divisor Latch Access Bit.
0
0
Disable access to Divisor Latches.
1
Enable access to Divisor Latches.
31:
8
-
-
Reserved
-