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TS68HC901CFN8 Scheda tecnica(PDF) 11 Page - STMicroelectronics

Il numero della parte TS68HC901CFN8
Spiegazioni elettronici  HCMOS MULTI-FUNCTION PERIPHERAL
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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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,
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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