Hi , I am developing on POS system. I need maximum memory supported by
8051 i.e 64k. I am an newbie to 8051. Can anybody suggest the RAM chips, manufacturers. Also plz suggest how to connect 64k RAM and 64k EEPROM.Thanks in advance.
Manikandan.P
"Manikandan" ha scritto nel messaggio news: snipped-for-privacy@posting.google.com...
flat 16 mb address space. You can use any flash-ram you need
regards
Rinux schrieb:
And you think this is the right approach for a newbie who doesn't even know how to attach memory to the 8051?
I would rather suggest to simply read the data sheets and user manuals of the standard 80C51 which are available from different manufacturers. For a start, I would suggest looking at Atmel and Philips for their
89C51/52 parts. They also offer a lot of application notes.(And to the OP: read before asking.)
-- Dipl.-Ing. Tilmann Reh Autometer GmbH Siegen - Elektronik nach Maß. http://www.autometer.de ================================================================== In a world without walls and fences, who needs Windows and Gates ? (Sun Microsystems)
You should look unde external RAM connecting, and for EEPROM you can use serial EEPROM with I2C protocol.
But why do you need soo much RAM couldn't 1024 bytes be enough? BTW, T89C51CC01 , T89C51AC2 and similar chips from Atmel (Temic & Wireless) have 1kB of RAM and 1kB of EEPROM on-chip.
The 89C51RD2 (which is really an 8xC52) has 64k flash built in, so you can use that. Rumour has it that the Philips version has fewer problems than the Atmel.
You'll need external RAM, just a 74HC573 to latch the address bits. You'll lose nearly all the IO lines though (3 ports worth), so you might need a bit of address decoding (74HC/AC138) and external IO (just 74HC's again) to make up, and you'll end up with a bit less than 64k RAM. Almost any 5V 1Mx8 SRAM will give you far more than you can cope with.
Paul Burke
May I suggest having a read of all the tutorials
Also the datasheets and app notes from the 8051 chip manufacturer.
Alex
In article , Manikandan writes
see the C51 Primer at
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \/\/\/\/\ Chris Hills Staffs England /\/\/\/\/\ /\/\/ snipped-for-privacy@phaedsys.org
I assume you sell Philips?
? why?
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \/\/\/\/\ Chris Hills Staffs England /\/\/\/\/\ /\/\/ snipped-for-privacy@phaedsys.org
In article , Rinux writes
You will also need a compiler to support the 24 bit addressing.
The most expensive of the Keil compiler suites does... but why would you need this much memory? All the 8051 compilers from the free ones to the most expensive will support the 64K model.
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \/\/\/\/\ Chris Hills Staffs England /\/\/\/\/\ /\/\/ snipped-for-privacy@phaedsys.org
In article , MArk writes
I would not suggest an I2C EEPROM... keep it simple just use ordinary memory.
why the CC01 or AC2? It is highly unlikey that the O/P will need CAN on a POS!! The Rd2 (Atmel or Philips) or preferably the Atmel EM2 as the RD2 is being phased out.
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \/\/\/\/\ Chris Hills Staffs England /\/\/\/\/\ /\/\/ snipped-for-privacy@phaedsys.org
"Manikandan"
Go to
Also study the AT89C51ED2 and AT89C51ID2 devices. Then, work out how much memory your app will actually need, including access tolerance, and NV needs - you can save chip count, for example, by using FRAM
-jg
another chip would be the winbond with 64KB flash
or with 128KB flash
also have you looked at any of the cygnal 8051 chips ?
but easy way to find app notes etc is google
intel app notes
Philips app notes
interfacing 8051 with 2 wire chips
dallas maxim 8051 app notes
Alex
From my personal experience with the T89C51RD2, AT89C51RD2, and the P89C51RD2, this is certainly false. I'd recommend the AT89C51RD2 (not the T89C51RD2 since it has reset/low voltage/brownout flash corruption problems). It has worked flawlessly in the last 2 products I've worked on. I can't say the same about the Philips, though. Besides being less flexible (bytewise programming in the flash not available), I couldn't get Philips to actually ship any to me.
-->Neil
No, just used it in a few jobs.
Because the OP said he wanted 64k, and there's only 1k on chip.
Paul Burke
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