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ST72321 数据表(PDF) 34 Page - STMicroelectronics |
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ST72321 数据表(HTML) 34 Page - STMicroelectronics |
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34 / 185 page  ST72321 34/185 INTERRUPTS (Cont’d) 7.3 INTERRUPTS AND LOW POWER MODES All interrupts allow the processor to exit the WAIT low power mode. On the contrary, only external and other specified interrupts allow the processor to exit from the HALT modes (see column “Exit from HALT” in “Interrupt Mapping” table). When several pending interrupts are present while exit- ing HALT mode, the first one serviced can only be an interrupt with exit from HALT mode capability and it is selected through the same decision proc- ess shown in Figure 19. Note: If an interrupt, that is not able to Exit from HALT mode, is pending with the highest priority when exiting HALT mode, this interrupt is serviced after the first one serviced. 7.4 CONCURRENT & NESTED MANAGEMENT The following Figure 20 and Figure 21 show two different interrupt management modes. The first is called concurrent mode and does not allow an in- terrupt to be interrupted, unlike the nested mode in Figure 21. The interrupt hardware priority is given in this order from the lowest to the highest: MAIN, IT4, IT3, IT2, IT1, IT0, TLI. The software priority is given for each interrupt. Warning: A stack overflow may occur without no- tifying the software of the failure. Figure 20. Concurrent Interrupt Management Figure 21. Nested Interrupt Management MAIN IT4 IT2 IT1 TRAP IT1 MAIN IT0 I1 SOFTWARE 3 3 3 3 3 3/0 3 11 11 11 11 11 11 / 10 11 RIM IT3 I0 10 PRIORITY LEVEL MAIN IT2 TRAP 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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