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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST72324BJ2 데이터시트(PDF) 37 Page - STMicroelectronics |
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ST72324BJ2 데이터시트(HTML) 37 Page - STMicroelectronics |
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37 / 188 page  ST72324B Interrupts 37/188 Figure 18. Interrupt processing flowchart 7.2.1 Servicing pending interrupts As several interrupts can be pending at the same time, the interrupt to be taken into account is determined by the following two-step process: ● the highest software priority interrupt is serviced, ● if several interrupts have the same software priority then the interrupt with the highest hardware priority is serviced first. Figure 19 describes this decision process. Figure 19. Priority decision process flowchart Table 13. Interrupt software priority levels Interrupt software priority Level I1 I0 Level 0 (main) Low High 10 Level 1 0 1 Level 2 0 0 Level 3 (= interrupt disable) 1 1 “IRET” RESTORE PC, X, A, CC Stack PC, X, A, CC load I1:0 from interrupt SW reg. Fetch next Reset TRAP Pending I nstruction I1:0 from stack load PC from interrupt vector Y N Y N Y N Interrupt has the same or a lower software priority The interrupt stays pending than current one Execute instruction I nterrupt PENDING SOFTWARE Different INTERRUPTS Same HIGHEST HARDWARE PRIORITY SERVICED PRIORITY HIGHEST SOFTWARE PRIORITY SERVICED |
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