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- From: laird@stable.ecn.purdue.edu (Kyler Laird)
- Newsgroups: sci.electronics
- Subject: can't clear M68HC705KICS interrupts (CLI/RTI)
- Message-ID: <laird.725818305@stable.ecn.purdue.edu>
- Date: 31 Dec 92 16:11:45 GMT
- Sender: news@noose.ecn.purdue.edu (USENET news)
- Organization: Purdue University Engineering Computer Network
- Lines: 20
-
- I'm just getting started with the ICS and have already lost my KICS
- manual, so maybe I'm missing something simple here. (Anyone have
- the number to use at Motorola to order another manual?)
-
- Whenever I trigger an external interrupt (using IRQ or low Port A pins)
- I get stuck in the interrupt handling routine. I'm using RTI, and have
- even tried CLI, but as soon as the instruction is hit (in the ICS), the
- PC jumps to the IRQ routine.
-
- Note that I don't go into the IRQ routine until I cause a valid trigger,
- and the IRQ pin (onscreen) does toggle from 1 to 0 and back as I change
- its level.
-
- Also, when running the Paced Loop Program I get extremely long delays
- between LED blinks even with RTIFs only counting down from 1 (instead of
- 3). Is this normal for the ICS?
-
- Thanks!
-
- --kyler
-