Lpc2000

Hi to all,

I am working on lpc2148.
I want to store a data into the microcontroller so that the data can 
be used even after power off/on.

Can anybody help me?

Thanks, 

JS

If you have just a few bytes to save, you can keep Vbat and use the 
alarm registers of the RTC and probably the RTC registers itself  if you 
don't mind loosing it (you probably will have to pull X1 down and select 
external  oscilator, or select the clock derived from the main oscilator 
and keep resseting the seconds register to avoid changes in the others).
But if you need more than a few bytes, then go to an e2prom or even a 
serial dataflash. They will give you a lot of non volatile memory using 
just a few i/o pins (2 or 4).


jingsian_lim wrote:
> Hi to all,
>
> I am working on lpc2148.
> I want to store a data into the microcontroller so that the data can
> be used even after power off/on.
>
> Can anybody help me?
>
> Thanks,
>
> JS
>
>
>
>
>
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[Non-text portions of this message have been removed]

> If you have just a few bytes to save, you can keep Vbat and 
> use the alarm registers of the RTC and probably the RTC 
> registers itself  if you don't mind loosing it (you probably 
> will have to pull X1 down and select external  oscillator, or 
> select the clock derived from the main oscillator and keep 
> resetting the seconds register to avoid changes in the others).
> But if you need more than a few bytes, then go to an e2prom 
> or even a serial dataflash. They will give you a lot of non 
> volatile memory using just a few i/o pins (2 or 4).

....Or use the flash on the lpc. There is Philips software on this yahoo
site that emulates an EEprom device using one (or more) flash segments.
It's reasonably smart in terms of not needing to erase the whole segment
till it's been filled.
I have used a modified version of this for both a logging and a
parameter storage application and it works fine. Beware you'll need to
disable interrupts during IAP calls, and if your application can't allow
this you'll have to copy some code into RAM (see other postings).

Yes, that's true, you can use the internal flash.

IMHO, the LPC is a fantastic processor, but it's flash system is a 
little bit less than it could be.
400mS for an erase cycle ? 4Kb minimum flash sector ? Minimum write of 
16 bytes ?
 I only think about using the internal flash if there is no other option 
available.
An e2prom is:
        cheap (about U$0,50)
         low power (less than 1uA in in idle)
        small (sot23 if you wish)
         fast (2mS to 5 ms per page (16 to 128 bytes depending on device))
        reliable (1milion  writes cycle or 10milion in selected devices)
        you don't have to mind about disable interrupts or copying code 
to ram
         and LPC devices come with 2 I2C interfaces.

But, Yes, you can always use the internal flash.

I think Philips could put some flash in small sectors (why not 4 or 8 
sectors of 128 or 256 bytes) (MSP430 have something like this)
If we can write to it and still execute code from the main flash, even 
better...

Hugs, Mauricio



Bruce Paterson wrote:
>
>
> > If you have just a few bytes to save, you can keep Vbat and
> > use the alarm registers of the RTC and probably the RTC
> > registers itself  if you don't mind loosing it (you probably
> > will have to pull X1 down and select external  oscillator, or
> > select the clock derived from the main oscillator and keep
> > resetting the seconds register to avoid changes in the others).
> > But if you need more than a few bytes, then go to an e2prom
> > or even a serial dataflash. They will give you a lot of non
> > volatile memory using just a few i/o pins (2 or 4).
>
> ....Or use the flash on the lpc. There is Philips software on this yahoo
> site that emulates an EEprom device using one (or more) flash segments.
> It's reasonably smart in terms of not needing to erase the whole segment
> till it's been filled.
> I have used a modified version of this for both a logging and a
> parameter storage application and it works fine. Beware you'll need to
> disable interrupts during IAP calls, and if your application can't allow
> this you'll have to copy some code into RAM (see other postings).
>
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>       Service <http://docs.yahoo.com/info/terms/>.
>
>
> ------------------------------------------------------------------------
>



[Non-text portions of this message have been removed]

There is an Application Note in the Files Section EEPROM... which
describes how to use the on chip Flash to simulate EEPROM.

Bob


--- In lpc2000@yahoogroups.com, Mauricio Scaff <scaffm@g...> wrote:
>
> If you have just a few bytes to save, you can keep Vbat and use the 
> alarm registers of the RTC and probably the RTC registers itself  if
you 
> don't mind loosing it (you probably will have to pull X1 down and
select 
> external  oscilator, or select the clock derived from the main
oscilator 
> and keep resseting the seconds register to avoid changes in the others).
> But if you need more than a few bytes, then go to an e2prom or even a 
> serial dataflash. They will give you a lot of non volatile memory using 
> just a few i/o pins (2 or 4).
> 
> 
> jingsian_lim wrote:
> > Hi to all,
> >
> > I am working on lpc2148.
> > I want to store a data into the microcontroller so that the data can
> > be used even after power off/on.
> >
> > Can anybody help me?
> >
> > Thanks,
> >
> > JS
> >
> >
> >
> >
> >
> > SPONSORED LINKS
> > Microcontrollers 
> >
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&c=4&s=95&.sig=mfaAujKZXA2Z_vxre9sGnQ>

> > 	Microprocessor 
> >
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&c=4&s=95&.sig=9jjd2D3GOLIESVQssLmLsA>

> > 	Intel microprocessors 
> >
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&c=4&s=95&.sig=OMnZuqMZX95mgutt4B-tDw>

> >
> > Pic microcontrollers 
> >
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontrollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&c=4&s=95&.sig=Malspbd0T4Rq3M4Q0nHrfw>

> >
> >
> >
> >
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------------------------------------------------------------------------

> >
> 
> 
> 
> [Non-text portions of this message have been removed]
>

Mauricio Scaff wrote:

>Yes, that's true, you can use the internal flash.
>
>IMHO, the LPC is a fantastic processor, but it's flash system is a 
>little bit less than it could be.
>  
>
Depends upon your expectations and use, you could always use some Dallas 
Battery RAMs..  heh.

I'm absolutely pleased with what they put together in the LPC2000 
family!  I have twin LPC2000 processors (LPC2106 + LPC2138) on this 
board, along with an SD card.  The board entirely self programs itself 
with 156K from the SD card in less than 18 seconds.  This is using both 
the ISP and IAP conmmands to program the two processors.  The longest 
time, and smallest binary, to program is over the ISP connection betwee 
processors.  While the IAP is doing 112K in less than 2 seconds.

Not too bad in my opinion, considering past experience with older Flash 
technologies.

This is far, far,  better than the older board design this one replaces 
where the end-customer had to contact the factory to get new EPROMs!

Regards,

TomW


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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