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參數(shù)資料
| 型號： | TS68HC901CFN8 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HCMOS MULTI-FUNCTION PERIPHERAL |
| 中文描述： | HCMOS多功能外設(shè) |
| 文件頁數(shù)： | 11/42頁 |
| 文件大?。?/td> | 369K |
| 代理商： | TS68HC901CFN8 |
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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,
sourcesmay beadded to theprioritized structureby
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-
nedinterrupt structure. TheIEIofthehighest priority
CMFPis tied low and the IEO output of this device
is tied to the next highest priority CMFP’s IEI. The
IEI andIEOsignalsaredaisy-chained inthismanner
for all CMFPs in the chain, with the lowest priority
CMFP’s IEO left unconnected. A diagram of an in-
terrupt daisy-chain is shownin figure8.
Daisy-chaining requires that all parts in the chain
have a commonIACK. When the common IACK is
asserted during an interrupt acknowledge cycle, all
partswillprioritize interrupts inparallel. WhentheIEI
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 partwhich 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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相關(guān)代理商/技術(shù)參數(shù) |
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