Need two 89C51RE2SLSUM MCUs!

Thanks for the speedy response.

The -669 was one of the chips we looked at originally. The -669 doesn't have the second UART, while the -RE2 does. This is a big deal to my employer. Also, it's being obsoleted. I've checked the data sheets on both. The -RE2 has the same pinout as both the -FB, which is what we're replacing, and the -MC2, which is our target for production. The -RE2 is just for code development, but we need something that is essentially the same. I didn't check the data sheets for all these, my engineering employer did, so here I am. If someone knows of a problem with these selections, please let us know!

Later!
kenjj

Thanks for the speedy response.

The -669 was one of the chips we looked at originally. The -669 doesn't have the second UART, while the -RE2 does. This is a big deal to my employer. Also, it's being obsoleted. I've checked the data sheets on both. The -RE2 has the same pinout as both the -FB, which is what we're replacing, and the -MC2, which is our target for production. The -RE2 is just for code development, but we need something that is essentially the same. I didn't check the data sheets for all these, my engineering employer did, so here I am. If someone knows of a problem with these selections, please let us know!

Later!
kenjj

Also, it's being obsoleted
I am aware of that, but for development which is to go to another processor, that should not be a problem.

I would check a bit better to make sure Arghmel has copied the MX technology well enough.

If you do not have MX in the Arghmel chip, state so and possibilities will pour out.

Erik

Thanks for the input, Erik. I have no idea if Atmel did an MX core clone. That's for others to determine. my criteria are:
- pin-out compatible with 87C51FB
- PLCC44 package
- two UARTs
- PCA
- FLASH with 32k or greater
I've checked NXP, Atmel, Winbond, SiLabs, and others.
Let the suggestions pour forth...

As for the -669, I stand corrected. It does have two UARTs. Where it differs is in the pinouts. My employer prefers a drop-in replacement for the -FB. Or, as close to drop-in as possible. Thus, the -MB2/MC2 or -RE2. He did limited testing with the -MB2 last year and deemed it suitable. Now he wants to get two of the -RE2s so he can evaluate that for possible development for future designs. And, who knows, we may go all-FLASH.

So, I'm still looking for two AT89C51RE2SLSUMs. Anyone?

Later!
kenjj

Thanks for the input, Erik. I have no idea if Atmel did an MX core clone. That's for others to determine.
Then why are you using a MX chip as replacement, (the only advantage of a MX chip is the 23 bit addressing of external memeory)?

my criteria are:
- pin-out compatible with 87C51FB
- PLCC44 package
- two UARTs
- PCA
- FLASH with 32k or greater
I've checked NXP, Atmel, Winbond, SiLabs, and others.
but have you searched the Keil device database

http://www.keil.com/dd/parm_search.asp

I just did it and said to myself "that can't be true" and found that the database bas a boo-boo that if you specify flash 32k or greater you gtet virtually no chips, just specify "don't care" for the flash size and scan manually.

Erik

Yes, I checked the same night I posted this originally. And, I selected 32k or greater at the time, so I redid the search as you suggest, with no preference for mem size. I got the same answers now as then. I can't use the first two chips, they are not PLCC44. And - Ta!Da! - the other recommendations are the -MA2/MB2/MC2 (all OTP) and the -RE2, which I have already mentioned in the post. There seems to be nothing new under the sun for this.

So, does anyone have two AT89C51RE2SLSUMs?

Thanks for the attention.
kenjj

erik

there is 'a million' uPsds and, if you can, for development go 3v3, the LPC952

Erik

There may be millions, I'd like to see what criteria you used for your search. If I drop PCA channels from the search I get gobs of choices. And out of those gobs, it's still the same four suitable candidates: the -MA2/MB2/MC2 and the -RE2. But I don't get to choose, my employer made these choices. I lobbied hard for the -952, everything we have on the product would be in the MCU, and it's $2.46 in qty/one!! But I got shot down, he wants a 87C51FB clone (preferably), with two UARTs and more mem space. The -MB2/MC2 fits the bill, and the -RE2 gives us FLASH.

So, my criteria are to start with a 87C51FB in PLCC44 packaging and add two UARTs. Thus:
-87C51FB pinout
-5V
-PCA channels
-two UARTs (or more)
-FLASH 32K or more (for this go-round)
If anyone has any suggestion(s) for suitable alternatives using these criteria, please let me know.

Otherwise, does anyone have two AT89C51RE2SLSUMs?

Thanks for the input so far.
kenjj

Ceibo, Nohau, Lauterbach ... more

that will be a much better development environment anyhow.

sorry about suggesting chips without what you had not said you needed.

Erik

Thanks for the suggestions, so far, Erik.

I'm hardly the resident programming expert. I'm aware that there are virtual environments available to build code in. My employer, however, has 10s of 1000s of lines of well established code existant, and an established code-testing methodology he is comfortable with. More power to him, lots of pay checks will attest to his ability to produce sellable products. Not that he's hide bound, he has adapted new parts and methods before, but he knows what he wants and needs, and it will take something supplying an undeniable advantage to make him leave his comfort zone.

And the comfort zone is a great place to be.
kenjj

it will take something supplying an undeniable advantage to make him leave his comfort zone
he might not take my word for it, but an ICE is "an undeniable advantage" for development and there is no need to "leave his comfort zone" in order to buy an ICE. The end result is the same (you do not do final test with the ICE plugged in)

Erik