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ST7LITE49K2 数据表(PDF) 58 Page - STMicroelectronics |
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ST7LITE49K2 数据表(HTML) 58 Page - STMicroelectronics |
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58 / 245 page  Interrupts ST7LITE49K2 58/245 8.4 Concurrent and nested management The following Figure 22 and Figure 23 show two different interrupt management modes. The first is called concurrent mode and does not allow an interrupt to be interrupted, unlike the nested mode in Figure 23. The interrupt hardware priority is given in this order from the lowest to the highest: MAIN, IT5, IT4, IT3, IT2, IT1, IT0. The software priority is given for each interrupt. Caution: A stack overflow may occur without notifying the software of the failure. Figure 22. Concurrent interrupt management Figure 23. Nested interrupt management MAIN IT5 IT3 IT2 IT0 IT2 MAIN IT1 I1 SOFTWARE 3 3 3 3 3 3/0 3 11 11 11 11 11 11 / 10 11 RIM IT4 I0 10 PRIORITY LEVEL MAIN IT2 TLI MAIN IT0 3 2 1 3 3 3/0 3 11 00 01 11 11 11 RIM IT1 IT4 IT4 IT1 IT2 IT3 I1 I0 11 / 10 10 SOFTWARE PRIORITY LEVEL |
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