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TS68HC901 Folha de dados(PDF) 11 Page - STMicroelectronics |
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TS68HC901 Folha de dados(HTML) 11 Page - STMicroelectronics |
11 / 42 page DAISY-CHAINING CMFPs As an interrupt controller, the TS68HC901 CMFP will support eight external interrupt sources in addi- tion to its eight internal interrupt sources. When a system requires more than eight external interrupt sources to be placed at the same interrupt level, sources may be added to the prioritized structure by daisy-chaining CMFPs. Interrupt sources are priori- tized internally within each CMFP and the CMFPs are prioritized by their position in the chain. Unique vector numbers are provided for each interrupt sources. The IEI and IEO signals implement the daisy-chai- ned interrupt structure. The IEI of the highest priority CMFP is tied low and the IEO output of this device is tied to the next highest priority CMFP’s IEI. The IEI and IEO signals are daisy-chained in this manner for all CMFPs in the chain, with the lowest priority CMFP’s IEO left unconnected. A diagram of an in- terrupt daisy-chain is shown in figure 8. Daisy-chaining requires that all parts in the chain have a common IACK. When the common IACK is asserted during an interrupt acknowledge cycle, all parts will prioritize interrupts in parallel. When the IEI signal to a CMFP is asserted, the part may respond to the IACK cycle if it requires interrupt service. Otherwise, the part will assert IEO to the next lower priority device. Thus, priority is passed down the chain via IEI and IEO until a part which has appen- ding interrupt is reached. The part with the pending interrupt passes a vector number to the processor and does not propagate IEO. Figure 9a : Figure 9b : ® TS68HC901 11/42 |
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