LSI Logic Confidential
15-86
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
UART1 Interrupt Identification Register (IIR)
Offset = 0xBE0108 / 0xBE0188
Read only
Default = 0x0100 0000
The data in this register indicates to the host processor if an interrupt is
pending, and identifies the highest priority interrupt in the UART that is
requesting service.
FIFO
31:30
A value of 11 in this field indicates the FIFO mode of
operation. Otherwise, these two bits are set to 0.
P3, P2, P1, P0Priority
27:24
These bits give the interrupt type and priority, as shown
in
31
30
29
28
27
26
25
24
23
16
FIFO
0
0
P3
P2
P1
P0
RSVD
15
0
RSVD
Table 15.11 Interrupt Identification Register Details
P3
P2
P1
P0
Priority
Level
Interrupt Type
0
0
0
1
-
None
0
1
1
0
Highest
Receiver Line Status
0
1
0
0
Second
Receiver Data Available or Trigger Level Reached
1
1
0
0
Second
Character Time-out Indication
0
0
1
0
Third
THR Empty
0
0
0
0
Lowest
Modem Status
Содержание DMN-8600
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