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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92195C датащи(PDF) 47 Page - STMicroelectronics |
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ST92195C датащи(HTML) 47 Page - STMicroelectronics |
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47 / 249 page  47/249 ST92195C/D - 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 on page 47) the ei instruction is not used within the interrupt service routines. This means that no new interrupt can be serviced in the middle of the cur- rent one. The interrupt routines will thus be serv- iced 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 |
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