參數(shù)資料
型號: IT8673F
廠商: Electronic Theatre Controls, Inc.
英文描述: GT 35C 35#12 SKT PLUG
中文描述: 先進的輸入/輸出(高級I / O)的初步規(guī)范V0.5
文件頁數(shù): 86/128頁
文件大?。?/td> 780K
代理商: IT8673F
IT8673F
6
Table 11-27. Interrupt Identification Register
FIFO
Mode
Interrupt
Identification
Register
Interrupt Set and Reset Functions
Bit 3
Bit 2
Bit 1
Bit 0
Priority
Level
Interrupt Type
Interrupt Source
Interrupt Reset Control
0
X
X
1
-
None
None
-
0
1
1
0
First
Receiver Line Status
OE, PE, FE, or BI
Read LSR
0
1
0
0
Second
Received Data
Available
Received Data
Available
Read RBR or FIFO
drops below the trigger
level
1
1
0
0
Second
Character Time-out
Indication
No characters have
been removed from or
input to the RCVR FIFO
during the last 4
character times and
there is at least 1
character in it during
this time
Read RBR
0
0
1
0
Third
Transmitter Holding
Register Empty
Transmitter Holding
Register Empty
Read IIR if THRE is the
Interrupt Source
Write THR
0
0
0
0
Fourth
Modem Status
CTS#, DSR#, RI#,
DCD#
Read MSR
Note
: X = Not defined
IIR(7), IIR(6): Are set when FCR(0) = 1.
IIR(5), IIR(4): Always logic 0.
IIR(3): In non-FIFO mode, this bit is a logic 0. In the FIFO mode, this bit is set along with bit 2 when a
time-out interrupt is pending.
IIR(2), IIR(1): Used to identify the highest priority interrupt pending.
IIR(0): Used to indicate a pending interrupt in either a hard-wired prioritized or polled FAN with a logic 0
state. In such a case, IIR contents may be used as a pointer to the appropriate interrupt service routine.
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