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ST92F120 Datasheet(PDF) 70 Page - STMicroelectronics |
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ST92F120 Datasheet(HTML) 70 Page - STMicroelectronics |
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70 / 324 page  70/324 ST92F120 - INTERRUPTS ARBITRATION MODES (Cont’d) re-enabled, they will be acknowledged regardless of the interrupt service routine’s priority. This may cause undesirable interrupt response sequences. 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 32) 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 32. 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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