Thanks! Mr. steve:
I think it is a solve for my problem. but I think it isn't best solve. Now, I use a timer interrupt read to the port E of MCU and call same program during port F is low level. then I don't need de-bounce circuit and it isn't real-time program. I want use the IRQ pin interrupt function during a low level is generate. Can you help me?
shaoan 4.11
Steve Russell <stever@...> wrote:
Shaoan,
What I was trying to explain was:
If you use an interrupt, you need to add the de-bounce circuit and getting
the software to work is more complicated.
On the other hand if you just read the contact as a bit in some input port
in a timer interrupt, you do not need a de-bounce circuit.
I am not sure what other functions you have working in your software, but
most MCU applications end up with a timer interrupt of some sort. If your
port is read in the interrupt code, then you need no extra de-bounce
circuits and the code is simpler.
Steve
At 08:12 PM 4/10/2003, you wrote:
>Hello,Sir:
> Thamk you for your help, I think so. but I need use a mechanical
> switch control to MCU and iI have append a debounce circuit in my
> ECU.tell me how do it, please
>Steve Russell <stever@...> wrote:Shaoan,
>
>If you are using a mechanical switch or relay to generate the interrupt,
>you will likely get many interrupts per switch operation due to "contact
>bounce".
>
>Contact bounce occurs on conventional switches and relays because when the
>moving contact hits the fixed contact it bounces away for short
>periods. The bounces can range from hundreds of microseconds to
>milliseconds. This normally happens only when the contact closes, not when
>it opens. However, this will be a problem if you use a contact to drive an
>interrupt as the switch has to close at some point in the full operating
>cycle.
>
>If the switch is operated by a human being, a response time of 10
>milliseconds or longer is normally good enough, and you can just sample the
>contact every 10 milliseconds in a timer interrupt, and use that
>value. The bouncing seldom lasts longer than 20 milliseconds, so the
>effect of the bounce is just a 10 millisecond jitter in reacting to the
>contact closure.
>
>If you need really good response, as for an action computer game with fast,
>skilled players, sampling at 1 millisecond intervals and more complicated
>code that reacts to the first closure of the contact but ignores the
>bounces may be required.
>
> Steve
>
>At 06:26 PM 4/10/2003, you wrote:
>
> >Hello,Mr. Charlie:
> > this is a controller for car, I have programming same interrupt
> > service program in my code and I believe any interrupt request have been
> > a corresponding program. I hope that when a switch is turn on, a low
> > level is appearing in IRQ pin of MCU. in this time, MCU is call my
> > program and does same work, for example, a lamp is lighting. I think the
> > low level is vrey long for the switch, MCU is get a repeat of the
> > interrupt service routine, so HALTED is generated is from a double bus
> fault.
> > In MC68HC11 et al, I can set-up the interrupt service routine is
> > generated by level edgt , but I can't it in MC683xx, I don't find it's
> > Register.
> > I have use a debugger to see if the ISR is even getting run by
> > placing a breakpoint in the ISR, an access to an address is not
> > terminated properly.
> > in EB265.PDF from motorola, it recommend is "For the general-purpose
> > timer (GPT), an input capture pin or pulse accumulator input pin can be
> > used." I don't know how do it(I have not TPU residual channels). give me
> > same example, please.
> > I can't write english letter, if it is error, I am very sorry!
> >best regards
> >shaoan
> >Melear Charles-rdph40 <charles.melear@...> wrote:Hello,
> >
> >Please give some more details on your problem. I am simply guessing on
> >this but if your program is simply halting (or appears to halt) when an
> >interrupt is asserted, my best guess is that you have not set up properly
> >for an Interrupt Acknowledgement Cycle.
> >
> >You can do this by programming a Chip Select Base Address and Chip Select
> >Option register. Set up the Base Address Register with the value
> >$FFF8. Then, in the Chip Select Option Register code the fields as
> >follows: Mode = Async, Field = Both Read and Write, Strobe = AS, DSACK =
> >0000, Space = CPU Space, IPL = 000 for all interrupts and AVEC = 1.
> >
> >If you have the Bus Monitor turned on in the SYPCR register and you have
> >not properly set up for the interrupt acknowledgement cycle, the machine
> >will take a Spurious Interrupt.
> >
> >Let me know if any of this works.
> >
> >Charlie
> >
> >-----Original Message-----
> >From: wflsa [mailto:wflsa@yahoo.com.cn]
> >Sent: Sunday, April 06, 2003 11:18 PM
> >To: 68300@yahoogroups.com; 68300@yahoogroups.com; 68300@yahoogroups.com
> >Subject: [68300] Can I user the Interrupt of MC68376
> >
> >
> >I hope use Interrupt server program in IRQ pin of the MC68376. when
> >a low level is generated, MCU is call my specify server program. Now,
> >I generate a low level is IRQx Pin, then MCU is Halted(can't work). I
> >don't know Why? please help me! thanks.
> >
> >
> >
> >
> >
> >
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RE: [68300] Can I user the Interrupt of MC68376
2003-04-11 by shaoan li