AVR-Chat

hi folks

pls respond to my query. i hv posted 4 quiries so far.
but no reply. i am beginner in using MCUs

i am doing a project on IVRS. am in the initial step.
i need some SLIC for ring detection and off hook. can
anybody suggest the best and affordable ic which can
be  interfaced with AVR 8515 MCU.

thanking u.

shibu


--- AVR-Chat@yahoogroups.com wrote:

> 
> There are 20 messages in this issue.
> 
> Topics in this digest:
> 
>       1. Re: Big data memory
>            From: "assault_wolf" <rodbergg@msoe.edu>
>       2. Re: Can someone double check my assumptions
> ATMega128 PWM
>            From: Brian Dean <bsd@bdmicro.com>
>       3. Interrupts
>            From: Eric <erichards@clear.net.nz>
>       4. Re: Interrupts
>            From: "Leon Heller"
> <leon.heller@dsl.pipex.com>
>       5. RE: Interrupts
>            From: "stevech" <stevech@san.rr.com>
>       6. Re: Interrupts
>            From: Eric <erichards@clear.net.nz>
>       7. Re: Interrupts
>            From: Eric <erichards@clear.net.nz>
>       8. Re: Re: Big data memory
>            From: Dave VanHorn
> <dvanhorn@dvanhorn.org>
>       9. Re: Interrupts
>            From: Dave VanHorn
> <dvanhorn@dvanhorn.org>
>      10. Re: Interrupts
>            From: "Leon Heller"
> <leon.heller@dsl.pipex.com>
>      11. Re: Interrupts
>            From: "Leon Heller"
> <leon.heller@dsl.pipex.com>
>      12. Re: Interrupts
>            From: Zack Widup <w9sz@prairienet.org>
>      13. RE: Interrupts
>            From: "stevech" <stevech@san.rr.com>
>      14. Re: Interrupts
>            From: Bernd Felsche
> <bernie@innovative.iinet.net.au>
>      15. Re: CVS
>            From: Matthew Cook
> <matthew.cook@iinet.net.au>
>      16. Re: Interrupts
>            From: Eric <erichards@clear.net.nz>
>      17. RE: Interrupts
>            From: "stevech" <stevech@san.rr.com>
>      18. Re: Interrupts
>            From: Dave VanHorn
> <dvanhorn@dvanhorn.org>
>      19. Quickstart for Engineers, fuse bits
>            From: "stefan_trethan"
> <stefan_trethan@gmx.at>
>      20. tiny26, motor driver, and ISP
>            From: ethan@bufbotics.org
> 
> 
>
________________________________________________________________________
>
________________________________________________________________________
> 
> Message: 1         
>    Date: Sat, 29 Jan 2005 15:57:48 -0000
>    From: "assault_wolf" <rodbergg@msoe.edu>
> Subject: Re: Big data memory
> 
> 
> OK, one thing everyone seems to be doing is assuming
> you need to
> actually keep the data in case of a power bump.  I'm
> going the
> opposite direction:  Try dual port SRAM or FIFO.
> 
> Cypress ( http://www.cypress.com/ ) makes a large
> number of Dual port
> SRAMS and FIFOs.  They're actually overkill speed
> wise, maybe.
> 
> Their listing of the dual ports are currently
> down.... but the FIFO's
> are up.  
> 
> Here's one that may suit your purposes:
> 
> http://www.cypress.com/portal/server.pt?space=Comm
> unityPage&control=SetCommunity&CommunityID=209&Pag
> eID=259&fid=12&rpn=CY7C4285
> 
> 100MHZ max operation speed, 18 bit width, 1M depth,
> unidirectional,
> which would give you your 16 bits plus 2 parity. 
> You could probably
> duplex two of their 9 bit x 1M devices together so
> that you share one
> 8 bit parallel link at the AVR end but you get the
> full 16 at the
> other.  Depends on how many pins you have to
> sacrifice.  Heck, you
> could use an SPI port expander to load the data if
> you really need the
> pins :)
> 
> It's even available in 3V and 5V versions.
> 
> Jerry
> 
> --- In AVR-Chat@yahoogroups.com, Dave VanHorn
> <dvanhorn@d...> wrote:
> <snipy>
> > Unfortunately, I don't think serial interface will
> be fast enough,
> although 
> > it would be acceptable for loading the data into
> memory.
> > What I'm envisioning, is a parallel connection, 8
> or preferrably 16
> bit, 
> > with the AVR just strobing pins to achieve the
> transfers by hitting
> read on 
> > the dataflash, and write on the other device, and
> letting the one
> drive the 
> > other.   I never need to "SEE" the data, I just
> need to shovel it.
> 
> 
> 
> 
> 
>
________________________________________________________________________
>
________________________________________________________________________
> 
> Message: 2         
>    Date: Sat, 29 Jan 2005 11:14:18 -0500
>    From: Brian Dean <bsd@bdmicro.com>
> Subject: Re: Can someone double check my assumptions
> ATMega128 PWM
> 
> Just FYI, I've implemented your function in one of
> my MAVRIC-II boards
> and verified the PWM signals from PORTE3 and PORTE4
> on my scope.  They
> work as I think you expect.  OCR3x = 0 gives a 0%
> duty, OCR3x = 1023
> gives 100% duty, and 0 < OCR3x < 1023 give a duty
> cycle proportionally
> in between.
> 
> It would still be worthwhile to verify your actual
> setup using a scope
> if possible and make sure that what you are feeding
> the h-bridge is
> correct.  Electronics are not indestructible, of
> course, and its
> possible that one of your PWM outputs has been
> damaged or something.
> Which side is not working, PORTE3 or PORTE4? 
> Whichever one, try using
> PORTE5 instead (OCR3C) and try again.  Be sure and
> turn on COM3C1 and
> DDRE bit 5 during initialization.  You can also use
> Timer1/PORTB5,6,7
> in the same way you are using Timer3/PORTE3,4,5. 
> Chances are that if
> the problem is a bad port pin, that all of them are
> not going to be
> bad.  If you get the same behaviour by moving to a
> different port
> pins, I'd lean toward the problem being in the
> h-bridge or wiring.
> 
> -Brian
> -- 
> Brian Dean
> BDMICRO - ATmega128 Based MAVRIC Controllers
> http://www.bdmicro.com/
> 
> 
> On Fri, Jan 28, 2005 at 11:44:08PM -0500, wbounce
> wrote:
> > To: <AVR-Chat@yahoogroups.com>
> > From: "wbounce" <wbounce@safeplace.net>
> > Date: Fri, 28 Jan 2005 23:44:08 -0500
> > Subject: RE: [AVR-Chat] Can someone double check
> my assumptions ATMega128 PWM
> > 
> > No and I would not know how to work with it
> anyhow. I will be going to
> > my club's meeting in 2 weeks and one of the guys
> there may have one.
> > >From what I see I do not think I am getting any
> pulse on the left side
> > and I am seeing some but not as much as I would
> expect on the right.
> > 
> > Hopefully, I can do some more checking tomorrow
> between helping my son
> > study for mid terms and starting to prepare my
> taxes. Too much work to
> > do and not enough robot time
> > 
> 
=== message truncated ===


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