參數(shù)資料
型號: MSM82C59A-2RS
廠商: OKI SEMICONDUCTOR CO., LTD.
英文描述: PROGRAMMABLE INTERRUPT CONTROLLER
中文描述: 可編程中斷控制器
文件頁數(shù): 13/28頁
文件大?。?/td> 186K
代理商: MSM82C59A-2RS
13/28
Semiconductor
MSM82C59A-2RS/GS/JS
(4) Programming the MSM82C59A-2
The MSM82C59A-2 receives two types of command words generated by the CPU.
(i)
Initialization Command Words (ICW1 thru ICW4)
Before commencing normal operations, each MSM82C59A-2 in the system must be
initialized by two to four
WR
pulse sequence.
ICW1
Initialization Sequence
ICW2
ICW3
In
Cascade
Mode
Is
ICW4
needed
Interrupt request
reception preparations
completed
ICW4
No (SNGL = 1)
Yes (SNGL = 0)
Yes (IC4 = 1)
No (IC4 = 0)
Contents of Interrupt Vector Byte in 86 System Mode
D
7
T
7
T
7
T
7
T
7
T
7
T
7
T
7
T
7
D
6
T
6
T
6
T
6
T
6
T
6
T
6
T
6
T
6
D
5
T
5
T
5
T
5
T
5
T
5
T
5
T
5
T
5
D
4
T
4
T
4
T
4
T
4
T
4
T
4
T
4
T
4
D
3
T
3
T
3
T
3
T
3
T
3
T
3
T
3
T
3
D
2
1
1
1
1
0
0
0
0
D
1
1
1
0
0
1
1
0
0
D
0
1
0
1
0
1
0
1
0
IR
7
IR
6
IR
5
IR
4
IR
3
IR
2
IR
1
IR
0
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