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ST90158P9C6 Ver la hoja de datos (PDF) - STMicroelectronics

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ST90158P9C6 8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM ST-Microelectronics
STMicroelectronics ST-Microelectronics
ST90158P9C6 Datasheet PDF : 199 Pages
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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
0
Priority Level of
Interrupt Request
1
INTERRUPT 2 HAS PRIORITY LEVEL 2
INTERRUPT 3 HAS PRIORITY LEVEL 3
INTERRUPT 4 HAS PRIORITY LEVEL 4
INTERRUPT 5 HAS PRIORITY LEVEL 5
2
3
INT 2
4
INT 3
INT 4
5
INT 5
ei CPL = 7
6
INT 5
7
MAIN
CPL is set to 7
INT 2
CPL = 7
INT 3
CPL = 7
INT 4
CPL = 7
MAIN
CPL = 7
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