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參數(shù)資料
| 型號： | ID8259A |
| 廠商： | Intel Corp. |
| 英文描述： | PROGRAMMABLE INTERRUPT CONTROLLER |
| 中文描述： | 可編程中斷控制器 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 325K |
| 代理商： | ID8259A |
8259A
OPERATION COMMAND WORDS
(OCWS)
After the Initialization Command Words (ICWs) are
programmed into the 8259A, the chip is ready to ac-
cept interrupt requests at its input lines. However,
during the 8259A operation, a selection of algo-
rithms can command the 8259A to operate in vari-
ous modes through the Operation Command Words
(OCWs).
Operation Control Words (OCWs)
OCW1
D5
A0
D7
D6
D4 D3 D2 D1
D0
1
M7
M6
M5
M4 M3 M2 M1 M0
OCW2
0
R
SL
EOI
0
0
L2
L1
L0
OCW3
0
0
ESMM
SMM
0
1
P
RR
RIS
231468–15
231468–16
Figure 8. Operation Command Word Format
13
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