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ST7232A 数据表(PDF) 30 Page - STMicroelectronics |
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ST7232A 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 157 page  ST7232A 30/157 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 16. 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 17 and Figure 18 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 18. The interrupt hardware priority is given in this order from the lowest to the highest: MAIN, IT4, IT3, IT2, IT1, IT0. The software priority is giv- en for each interrupt. Warning: A stack overflow may occur without no- tifying the software of the failure. Figure 17. Concurrent Interrupt Management Figure 18. 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 1 |
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