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ST7MC1K2-Auto 数据表(PDF) 60 Page - STMicroelectronics |
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ST7MC1K2-Auto 数据表(HTML) 60 Page - STMicroelectronics |
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60 / 371 page  Obsolete Product(s) - Obsolete Product(s) Interrupts ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 60/371 Figure 16. 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 17 describes this decision process. Table 16. 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 MCES Pending instruction 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 Interrupt has a higher software priority than current one Execute instruction interrupt Obsolete Product(s) - Obsolete Product(s) |
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