UM10503
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User manual
Rev. 1.3 — 6 July 2012
987 of 1269
NXP Semiconductors
UM10503
Chapter 38: LPC43xx UART1
38.6.4 UART1 Interrupt Enable Register (when DLAB = 0)
The IER is used to enable the four UART1 interrupt sources.
Table 851: UART1 Divisor Latch LSB Register when DLAB = 1 (DLL - address 0x4008 2000) bit description
Bit
Symbol Description
Reset value
7:0
DLLSB
Divisor Latch LSB.
The UART1 Divisor Latch LSB Register, along with the DLM register, determines the baud
rate of the UART1.
0x01
31:8
-
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
Table 852: UART1 Divisor Latch MSB Register when DLAB = 1 (DLM - address 0x4008 2004) bit description
Bit
Symbol Description
Reset value
7:0
DLMSB
Divisor Latch MSB.
The UART1 Divisor Latch MSB Register, along with the DLL register, determines the baud
rate of the UART1.
0x00
31:8
-
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
Table 853: UART1 Interrupt Enable Register when DLAB = 0 (IER - address 0x4008 2004) bit description
Bit
Symbol
Value
Description
Reset
value
0
RBRIE
RBR Interrupt Enable. Enables the Receive Data Available interrupt for UART1. It also
controls the Character Receive Time-out interrupt.
0
0
Disable the RDA interrupts.
1
Enable the RDA interrupts.
1
THREIE
THRE Interrupt Enable. Enables the THRE interrupt for UART1. The status of this
interrupt can be read from LSR[5].
0
0
Disable the THRE interrupts.
1
Enable the THRE interrupts.
2
RXIE
RX Line Interrupt Enable. Enables the UART1 RX line status interrupts. The status of
this interrupt can be read from LSR[4:1].
0
0
Disable the RX line status interrupts.
1
Enable the RX line status interrupts.
3
MSIE
Modem Status Interrupt Enable. Enables the modem interrupt. The status of this
interrupt can be read from MSR[3:0].
0
0
Disable the modem interrupt.
1
Enable the modem interrupt.
6:4
-
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA