參數(shù)資料
型號(hào)： MK68901
廠商： 意法半導(dǎo)體
英文描述： Multifunction Peripheral(多功能外圍電路)
中文描述： 多功能外圍（多功能外圍電路）
文件頁(yè)數(shù)： 8/33頁(yè)
文件大?。?/td> 313K
代理商： MK68901
Figure 10 :
A Conceptual Circuit of an Interrupt Channel.
Therearetwoend-of-interrupt modes:theautomat-
ic end-of-interrupt mode and thesoftwareend-of-in-
terruptmode. The mode isselected by writinga one
or a zeroto the S bit of theVector Register (VR). If
the Sbit of the VR is a one, all channels operate in
the software end-of-interrupt mode. If the S bit is a
zero, all channels operate in the automatic end-of-
interrupt mode, and a reset is held on all in-service
bits. In the automatic end-of-interrupt mode, the
pending bit is cleared when that channel passes its
vector. At that point, no further history of that inter-
rupt remains in the MK68901 MFP. In the software
end-of-interrupt mode, the in-service bit is set and
the pending bit is cleared when thechannel passes
itsvector.Withthein-servicebitset,nolowerpriority
channel is allowed to request an interrupt or to pass
its vector during an acknowledge sequence ; how-
ever, a lower priority channelmaystillreceive an in-
terruptand latchitintothe pendingbit.Ahigher prio-
rity channelmay stillrequest an interrupt andbe ac-
knowledged. The in-service bit of a particular chan-
nel may be cleared by writing a zero to the corre-
sponding bit in ISRA or ISRB. Typically, this will be
done at the conclusion of the interrupt routine just
before the return. Thusno lower priority channel will
beallowed torequestservice until the higherpriority
channel is complete, while channels of still higher
priority will be allowed to request service. While the
in-servicebit isset, a second interrupt onthat chan-
nelmaybereceivedandlatched intothependingbit,
though no service request will be made in re-
sponse tothesecond interrupt untilthe in-service bit
iscleared. ISRAand ISRB may beread atany time.
Only a zero may be written into any bit of ISRA and
ISRB;thusthein-service bitsmaybecleared insoft-
ware but cannot be set in software. This allows any
one bit to be cleared, without altering anyother bits,
simply by writingall ones except for the bit position
to be cleared to ISRA or ISRB, as with IPRA and
IPRB.
Figure 11 a :
A Conceptual Circuit of the MK68901 MFP Daisy Chaining.
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