Philips LPC2101 - UART1 Interrupt Enable Register (U1 IER - 0 Xe001 0004, When DLAB = 0)

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 01 — 12 January 2006 104
Philips Semiconductors
UM10161
Volume 1 Chapter 10: UART1
[1] Values in the row represent decimal equivalent of a 16 bit long content (DLM:DLL).
[2] Values in the row represent hex equivalent of a 16 bit long content (DLM:DLL).
[3] Refers to the percent error between desired and actual baudrate.
10.3.6 UART1 Interrupt Enable Register (U1IER - 0xE001 0004, when
DLAB = 0)
The U1IER is used to enable UART1 interrupt sources.
7200 00AE 174 0.2240 124 5/(5+2) 0.0064
9600 0082 130 0.1600 93 5/(5+2) 0.0064
19200 0041 65 0.1600 31 10/(10+11) 0.0064
38400 0021 33 1.3760 12 7/(7+12) 0.0594
56000 0021 22 1.4400 13 7/(7+5) 0.0160
57600 0016 22 1.3760 19 7/(7+1) 0.0594
112000 000B 11 1.4400 6 7/(7+6) 0.1600
115200 000B 11 1.3760 4 7/(7+12) 0.0594
224000 0006 6 7.5200 3 7/(7+6) 0.1600
448000 0003 3 7.5200 2 5/(5+2) 0.3520
Table 104: Baudrates available when using 20 MHz peripheral clock (PCLK = 20 MHz)
Desired
baudrate
MULVAL = 0 DIVADDVAL = 0 Optimal MULVAL & DIVADDVAL
U1DLM:U1DLL % error
[3]
U1DLM:U1DLL
dec
[1]
Fractional
pre-scaler value
MULDIV
MULDIV + DIVADDVAL
% error
[3]
hex
[2]
dec
[1]
Table 105: UART1 Interrupt Enable Register (U1IER - address 0xE001 0004, when DLAB = 0)
bit description
Bit Symbol Value Description Reset value
0RBR
Interrupt
Enable
0
U1IER[0] enables the Receive Data Available
interrupt for UART1. It also controls the Character
Receive Time-out interrupt.
0
Disable the RDA interrupts.
1 Enable the RDA interrupts.
1 THRE
Interrupt
Enable
0
U1IER[1] enables the THRE interrupt for UART1.
The status of this interrupt can be read from
U1LSR[5].
0
Disable the THRE interrupts.
1 Enable the THRE interrupts.
2 RX Line
Interrupt
Enable
0
U1IER[2] enables the UART1 RX line status
interrupts. The status of this interrupt can be read
from U1LSR[4:1].
0
Disable the RX line status interrupts.
1 Enable the RX line status interrupts.
3 Modem
Status
Interrupt
Enable
0
U1IER[3] enables the modem interrupt. The status
of this interrupt can be read from U1MSR[3:0].
0
Disable the modem interrupt.
1 Enable the modem interrupt.