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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1125 of 1441
NXP Semiconductors
UM10503
Chapter 40: LPC43xx/LPC43Sxx USART0_2_3
40.6.5 USART Interrupt Identification Register
IIR provides a status code that denotes the priority and source of a pending interrupt. The
interrupts are frozen during a IIR access. If an interrupt occurs during a IIR access, the
interrupt is recorded for the next IIR access.
Bits IIR[9:8] are set by the auto-baud function and signal a time-out or end of auto-baud
condition. The auto-baud interrupt conditions are cleared by setting the corresponding
Clear bits in the Auto-baud Control Register.
9
ABTOINTEN
Enables the auto-baud time-out interrupt.
0
0
Disable. Disable auto-baud time-out Interrupt.
1
Enable. Enable auto-baud time-out Interrupt.
31:10 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
Table 929. USART Interrupt Enable Register when DLAB = 0 (IER, addresses 0x4008 1004
(USART0), 0x400C 1004 (USART2), 0x400C 2004 (USART3)) bit description
Bit
Symbol
Value
Description
Reset
value
Table 930. USART Interrupt Identification Register, read only (IIR, addresses 0x4008 1008
(USART0), 0x400C 1008 (USART2), 0x400C 2008 (USART3)) bit description
Bit
Symbol
Value Description
Reset
value
0
INTSTATUS
Interrupt status.
Note that IIR[0] is active low. The pending interrupt can be
determined by evaluating IIR[3:1].
1
0
Interrupt pending. At least one interrupt is pending.
1
Not pending. No interrupt is pending.
3:1
INTID
Interrupt identification.
IER[3:1] identifies an interrupt corresponding to the
USART Rx FIFO. All other combinations of IER[3:1] not
listed below are reserved (100,101,111).
0
0x3
RLS. Priority 1 (highest). (Highest) Receive Line Status
(RLS).
0x2
RDA. Priority 2 - Receive Data Available (RDA).
0x6
CTI. Priority 2 - Character Time-out Indicator (CTI).
0x1
THRE. Priority 3 - THRE Interrupt.
0x0
Reserved. Priority 4 (lowest) - Reserved.
5:4
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
7:6
FIFOENABLE
Copies of FCR[0].
0
8
ABEOINT
End of auto-baud interrupt.
True if auto-baud has finished successfully and interrupt is
enabled.
0
9
ABTOINT
Auto-baud time-out interrupt.
True if auto-baud has timed out and interrupt is enabled.
0
31:10 -
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA