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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)： | 11/24頁 |
| 文件大小： | 325K |
| 代理商： | ID8259A |
8259A
Initialization Command Word 4 (ICW4)
SFNM: If SFNM
e
1 the special fully nested mode
is programmed.
If BUF
e
1 the buffered mode is pro-
grammed. In buffered mode SP/EN be-
comes an enable output and the master/
slave determination is by M/S.
If buffered mode is selected: M/S
e
1
means the 8259A is programmed to be a
BUF:
M/S:
master, M/S
e
0 means the 8259A is pro-
grammed to be a slave. If BUF
e
0, M/S
has no function.
If AEOI
e
1 the automatic end of interrupt
mode is programmed.
Microprocessor mode:
m
PM
e
0 sets the
8259A for MCS-80, 85 system operation,
m
PM
e
1 sets the 8259A for 8086 system
operation.
AEOI:
m
PM:
231468–10
231468–11
Figure 7. Initialization Command Word Format
11
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