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ST9 数据表(PDF) 49 Page - STMicroelectronics

部件名 ST9
功能描述  USER GUIDE
PDF  146 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST9 数据表(HTML) 49 Page - STMicroelectronics

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ST9 USER GUIDE
Figure 17
. Example with Nested Interrupts Enabled
Figure 18
. Example with Nested Interrupts Disabled
6
5
4
3
2
1
0
7
Priority
Main program
Interrupt #2
Main program
CPL is
CPL = 5
CPL = 2
CPL = 5
CPL = 7
ei
Interrupt #2 has priority level 2
Interrupt #5 has priority level 3
Interrupt #6 has priority level 6
Main program has priority level 7
Interrupt #5
Interrupt #6
Interrupt #5
CPL = 6
Interrupt #6 is requested
but not served because
its priority is lower than
the current CPL
Interrupt #5
is requested
Interrupt #2
is requested
and served
(automatically)
set to 7
di
ei
ei
ei
Nested mode: IAM bit =”1”
IEN is set to “1” by the programmer
(Interrupt #5 can be served)
Level
6
5
4
3
2
1
0
7
Priority
Main program
Interrupt #2
Main program
CPL is
CPL = 5
CPL = 2
CPL = 7
ei
Interrupt #2 has priority level 2
Interrupt #5 has priority level 3
Interrupt #6 has priority level 6
Main program has priority level 7
Interrupt #6
Interrupt #5
CPL = 6
Interrupt #6
Interrupt #5
is requested
Interrupt #2
is requested
(automatically)
set to 7
di
Nested mode: IAM bit =”1”
IEN is not set to “1” by the programmer
(Interrupt #5
can be served)
is requested
Level



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