UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
952 of 1269
NXP Semiconductors
UM10503
Chapter 37: LPC43xx USART0_2_3
IER
R/W
0x004
Interrupt Enable Register. Contains individual interrupt
enable bits for the 7 potential USART interrupts (DLAB = 0).
0x00
IIR
RO
0x008
Interrupt ID Register. Identifies which interrupt(s) are
pending.
0x01
FCR
WO
0x008
FIFO Control Register. Controls USART FIFO usage and
modes.
0x00
LCR
R/W
0x00C
Line Control Register. Contains controls for frame formatting
and break generation.
0x00
-
-
0x010
Reserved -
-
LSR
RO
0x014
Line Status Register. Contains flags for transmit and receive
status, including line errors.
0x60
-
-
0x018
Reserved -
-
SCR
R/W
0x01C
Scratch Pad Register. Eight-bit temporary storage for
software.
0x00
ACR
R/W
0x020
Auto-baud Control Register. Contains controls for the
auto-baud feature.
0x00
ICR
R/W
0x024
IrDA control register (USART3 only)
0x00
FDR
R/W
0x028
Fractional Divider Register. Generates a clock input for the
baud rate divider.
0x10
OSR
R/W
0x02C
Oversampling Register. Controls the degree of
oversampling during each bit time.
0xF0
-
-
0x030 -
0x03C
Reserved
-
-
HDEN
R/W
0x040
Half-duplex enable Register
-
-
0x044
Reserved -
-
SCICTRL
R/W
0x048
Smart card interface control register
0x00
RS485CTRL
R/W
0x04C
RS-485/EIA-485 Control. Contains controls to configure
various aspects of RS-485/EIA-485 modes.
0x00
RS485ADRMATCH R/W
0x050
RS-485/EIA-485 address match. Contains the address
match value for RS-485/EIA-485 mode.
0x00
RS485DLY
R/W
0x054
RS-485/EIA-485 direction control delay.
0x00
SYNCCTRL
R/W
0x058
Synchronous mode control register.
0x00
TER
R/W
0x05C
Transmit Enable Register. Turns off USART transmitter for
use with software flow control.
0x01
Table 821. Register overview: USART0/2/3 (base address: 0x4008 1000, 0x400C 1000, 0x400C 2000)
Name
Access Address
offset
Description
Reset
value
Reference