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ST90R158 датащи(PDF) 51 Page - STMicroelectronics

номер детали ST90R158
подробное описание детали  8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST90R158 датащи(HTML) 51 Page - STMicroelectronics

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ST90158 - INTERRUPTS
ARBITRATION MODES (Cont’d)
Examples
In the following two examples, three interrupt re-
quests with different priority levels (2, 3 & 4) occur
simultaneously during the interrupt 5 service rou-
tine.
Example 1
In the first example, (simplest case, Figure 21) the
ei
instruction is not used within the interrupt serv-
ice routines. This means that no new interrupt can
be serviced in the middle of the current one. The
interrupt routines will thus be serviced one after
another, in the order of their priority, until the main
program eventually resumes.
Figure 21. Simple Example of a Sequence of Interrupt Requests with:
- Concurrent mode selected and
- IEN unchanged by the interrupt routines
6
5
4
3
2
1
0
7
Priority Level of
MAIN
INT 5
INT 2
INT 3
INT 4
MAIN
INT 5
INT 4
INT 3
INT 2
CPL is set to 7
CPL = 7
CPL = 7
CPL = 7
CPL = 7
CPL = 7
ei
INTERRUPT 2 HAS PRIORITY LEVEL 2
INTERRUPT 3 HAS PRIORITY LEVEL 3
INTERRUPT 4 HAS PRIORITY LEVEL 4
INTERRUPT 5 HAS PRIORITY LEVEL 5
Interrupt Request
9



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