Author Topic: Copy & Write from/to Atmel AT27C256R70PU  (Read 5458 times)

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Offline bookabooTopic starter

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Copy & Write from/to Atmel AT27C256R70PU
« on: March 29, 2013, 10:32:54 am »
Hi All,

I've been handed a problem at work.
Back in the day, one of the consultant engineers wrote a bunch of code for using  Atmel, I don't know the full story but for some reason he didn't leave source code for some of his projects, but we have master chips for everything. Never been a problem until now since all that stuff is obsolete and it's just the occasional repair/replace chip we need.

However our Atmel programmer has given up the ghost, off to Atmel for repair. In the meantime I've been tasked to make a couple of copies.
I know next to nothing about Atmel chips, but I just need to read from our master AT27C256R and write 3 or 4 copies.
Atmel quote ~$700.00 for a programmer, which I'm sure is just plain wrong.

I was wondering if one of the cheapo generic programmers would do, like :
http://www.aliexpress.com/item/Lowest-Price-Free-shipping-SP300U-USB-Programmer-For-51-AVR-ATMEL-MICROCHIP-SST-STC-93-25/738831892.html
I dont see the AT27C256R listed in the devices though.
I'd prefer something I can just put a dip chip into, there's no ISP headers on any of our gear.


Thanks in advance for any help or suggestions.
 

Offline amyk

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #1 on: March 29, 2013, 11:17:55 am »
Not an exotic part. According to the datasheet it uses the standard 100us pulse at 6.5V+13V programming algorithm. Microchip's 27C256 is programmed the same way.

That particular programmer you link to mentions none of the 27C series devices, so I doubt it's suitable for this purpose. Someone else here asked for a 27C256 programmer before.
 

Offline notsob

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #2 on: March 29, 2013, 12:01:18 pm »
Refer to https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/

the minipro TL866 has the Atmel AT27C256R in it's list of supported devices
 

Offline westfw

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #3 on: March 30, 2013, 05:20:18 am »
The chip is an EPROM, not a microcontroller, so none of the cheap and readily available AVR microcontroller programmers will support it.  It's also relatively complex to program compared to most modern microcontrollers (parallel address and data bus, high voltages, critical timing.)  $700 is pretty cheap for a "universal" programmer of the sort usually used to program these.  You could try http://www.ebay.com/itm/TOP853-USB-Universal-Programmer-EPROM-MCU-GAL-PIC-abw-/140922513564?pt=LH_DefaultDomain_0&hash=item20cfa2e89c or similar.
(Don't you have a device programmer for the chip, even if you don't have the source code?)
(This is also an "odd" part to be associated with Atmel Microcontrollers, except perhaps for their legacy 8051 chips.)
 

Offline amyk

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #4 on: March 30, 2013, 08:35:40 am »
It's from the 27Cxx series, not uncommon to anyone who has worked in embedded systems for some time.
 

Offline bookabooTopic starter

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #5 on: April 04, 2013, 01:44:36 pm »
Thanks all.

I'm going to order the TL866 via ebay http://www.ebay.co.uk/itm/High-Performance-USB-TL866CS-Universal-Programmer-with-7-Adapters-for-12000-ICs-/170898487771?pt=LH_DefaultDomain_0&hash=item27ca57f9db

I will report back on the success or failure, fingers crossed.
 

Offline olsenn

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #6 on: April 04, 2013, 01:48:38 pm »
How about an AVR Dragon?

The MiniPro is good if you just want to read/write a hex file to new chips, but if you want to do any kind of debugging or direct-programming from AVR Studio, then you'll want the Dragon.
 

Offline amyk

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #7 on: April 05, 2013, 12:04:31 pm »
How about an AVR Dragon?

The MiniPro is good if you just want to read/write a hex file to new chips, but if you want to do any kind of debugging or direct-programming from AVR Studio, then you'll want the Dragon.
He's talking about Atmel EPROMs, not AVRs, and I'm pretty sure the Dragon doesn't double as an EPROM programmer. :palm:
 

Offline bookabooTopic starter

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Re: Copy & Write from/to Atmel AT27C256R70PU
« Reply #8 on: May 10, 2013, 09:43:48 am »
As promised I'm reporting back with what looks like success.
The unit I bought off ebay arrived yesterday, took about 8 days from China (delay in ordering was due to purchasing dept naturally).

It read the EEPROM and flashed it into a blank one, will be tested next time an engineer is on site with that equipment.
Havn't had too much time to play with the TL866 but at the price it sure looks value.

Thanks all :)
 


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