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'Global interupts enable'
1999\10\27@010706 by Mathew Cohen

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I realise that but what if I do not want to use all interupts. Why would I
want to enable them all???


Matt



----- Original Message -----
From: Gennette Bruce <spam_OUTbruce.gennetteTakeThisOuTspamTAFE.NSW.EDU.AU>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, October 27, 1999 2:58 PM
Subject: Re: Thankyou John Considine.


> > {Original Message removed}

1999\10\27@014702 by Tony Nixon

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Mathew Cohen wrote:
>
> I realise that but what if I do not want to use all interupts. Why would I
> want to enable them all???

Each Interrupt has it's own individual on/off switch, and the Global
Interrupt enable is like the main switch for all them. So, even if the
Global switch is on, only the ones that you have enabled will work.

--
Best regards

Tony

http://www.picnpoke.com
Email salesspamKILLspampicnpoke.com

1999\10\27@113107 by Byron A Jeff

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>
> I realise that but what if I do not want to use all interupts. Why would I
> want to enable them all???

You've misinterpreted what she's saying. When the GIE is off, all interrupts
are disabled. However when the GIE is on, then any interrupts that have been
enabled by setting the individual interrupt enable flags are then turned on.
Think of GIE as the interrupt mask in other architectures, where all interrupts
are disabled when it is off but interrupts are allowed to happen if it is on.
You still have to enable the individual interrupts also.

BAJ

1999\10\27@133817 by James Paul

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On Wed, 27 October 1999, Byron A Jeff wrote:

Think of it in terms of your house electricity.
You have the MAIN circuit breaker (Fuse) which
enables all the lights in the house.  You now have
to turn on each light if you want to use it.  You
don't have to use the MAIN to turn the lights on and
off.  Likewise, if you don't have the MAIN on, you
can't use any of the lights in the house.  So to
parallel your question in terms of the house
electricity, would be to say "Why do I have to turn
on the MAINS.  All I want to do is turn on the living
room light.  I don't want to use them all."
I hope this makes it clearer.

                                Regards,

                                  Jim






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1999\10\27@151055 by James Paul

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  Think of it in terms of your house electricity.
You have the MAIN circuit breaker (Fuse) which
enables all the lights in the house.  You now have
to turn on each light if you want to use it.  You
don't have to use the MAIN to turn the lights on and
off.  Likewise, if you don't have the MAIN on, you
can't use any of the lights in the house.  So to
parallel your question in terms of the house
electricity, would be to say "Why do I have to turn
on the MAINS.  All I want to do is turn on the living
room light.  I don't want to use them all."  I hope this makes it clearer.
                                Regards,                                  Jim








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