UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
962 of 1269
NXP Semiconductors
UM10503
Chapter 37: LPC43xx USART0_2_3
37.6.11 IrDA Control Register (USART3)
The IrDA Control Register enables and configures the IrDA mode for USART3 only. The
value of U3ICR should not be changed while transmitting or receiving data, or data loss or
corruption may occur.
Remark:
IrDA is available on USART3 only.
Table 833. Autobaud Control Register (ACR - addresses 0x4008 1020 (USART0), 0x400C
1020 (USART2), 0x400C 2020 (USART3)) bit description
Bit
Symbol
Value Description
Reset
value
0
START
Start bit.
This bit is automatically cleared after auto-baud
completion.
0
0
Auto-baud stop (auto-baud is not running).
1
Auto-baud start (auto-baud is running). Auto-baud run
bit. This bit is automatically cleared after auto-baud
completion.
1
MODE
Auto-baud mode select bit.
0
0
Mode 0.
1
Mode 1.
2
AUTORESTART
Restart bit.
0
0
No restart
1
Restart in case of time-out (counter restarts at next
USART Rx falling edge)
7:3
-
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
0
8
ABEOINTCLR
End of auto-baud interrupt clear bit (write-only).
0
0
Writing a 0 has no impact.
1
Writing a 1 will clear the corresponding interrupt in the
IIR.
9
ABTOINTCLR
Auto-baud time-out interrupt clear bit (write-only).
0
0
Writing a 0 has no impact.
1
Writing a 1 will clear the corresponding interrupt in the
IIR.
31:10 -
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
0
Table 834. IrDA Control Register (ICR - address 0x4000 8024) bit description
Bit
Symbol
Value Description
Reset
value
0
IRDAEN
IrDA mode enable.
0
0
IrDA mode on USART3 is disabled, USART3 acts as a
standard USART.
1
IrDA mode on USART3 is enabled.