Wanted: 80C51-based MCU

Oops on that empty post. Have you considered an ARM? Incredible performance.

Hello, I studied the 8051 MCU family alot at tafe. If you want I can give you a schematic with an 8031 MCU, external eprom and external ram. The circuit uses an intel 8255 which is a PIO chip. Are you wanting a schematic diagram or are you after hardware such as just a MCU or a whole Single Board Computer made. Feel free to contact me at snipped-for-privacy@dodo.com.au. P.S. I have an 8031 chip and a 8255 chip.

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An Atmel AT89S8253 is a good start. It's basically an upscale 8051, and it has non-volatile EEPROM storage on board, which often makes designs simpler. Plus some other stuff, but maybe you won't need all that.

I agree with Eeyore. (Gak! I can't believe I'm saying that!!) Emulating on 8051 is pretty much a waste of time, even when doing assembler. Of course, that's because "we";ve been programming with this baby for years, and have simulated it to death!! For a newbie, it probably is instructive! and there are many freeware/shareware emulation / simulator programs out there. Some better than others...

Any particular 8051 or derivative probably won't be around 20 years from now, but many are drop-in compatible. Heck, YOU may not be around 20 years for now!! But I do think 8051's in general are here to stay.

Program storage is usually done in FLASH these days, not EPROM. Good luck. -mpm

Any particular 8051 or derivative probably won't be around 20 years from now, but many are drop-in compatible. Heck, YOU may not be around 20 years for now!! But I do think 8051's in general are here to stay.

Program storage is usually done in FLASH these days, not EPROM. Good luck. -mpm

Just how long was the 8748 around.... :) isn't the 51 based on that core? I reckon the 51 will be here in 20 years, sadly I probably won't :(

Is an ARM code-compatible to the 8051? My application would work down to the 32+KHz "crystal" clock rate and still be more than fast enough.

I would like to have everything on one chip, instead of having a "large" MCU (22+pins) connected to a lot of external logic, etc. as i can do what i need with a few discrete logic ICs (except for the UART interface).

Thanks.

Assembler? No, not even close, the ARM is a 32-bit architecture but it should meet all the requirements you listed. By ARM I mean ARM7-TDMI. If you can write assembler for the 805x, you should have no trouble understanding the ARM instruction set.

It would likely be easier to make suggestions if we knew what the actual application was. Is it a secret? ;-)

I already have code for most of what i need to do; written in "ASM" for the 8051 a goodly number of years ago. That code seems to be round-robin polling of various input pins with program path depending on internal state as well as input status. All paths have been "normalized" in time-to-execute via use of a thumb-twiddle routine such that the program cycle time remains exactly constant no matter the states involved. That is to say, each and every instruction's time (1 or 2 or...ticks) has been taken into account; a change to any part of the program is fed to a special program to calculate the new execution time, and the appropiate count is applied for a call to the thumb-twiddler. A am still slightly familiar with what was done (and how), and so want to stick with the same basic MPU. Seems the 89S52 is ideal; it even has an extra byte of I/O! Now all i need to get is an emulator board with ASM software to support that MPU.

"Robert Baer" skrev i en meddelelse news: snipped-for-privacy@corp.supernews.com...

Atmel does them:

On Tue, 04 Dec 2007 16:15:01 -0800, Robert Baer wrote: ...

Have you tried calling the people who are supplying the 89S52?

Good Luck! Rich

Atmel

I have e-mailed Atmel.

Check.

I have a bunch of 80C537's I think that's what they are anyway. 68 lead PLCC's from Siemens

=EF=BF=BDMust have 4 bytes (32 pins) I/O.

=EF=BF=BD68

Keil has a (free, I think?) software emulator program (simulator). "Microvision 3" The freebie version is code limited to 2K (perhaps this is enough for you?) But even the non-free version is not very expensive.

You can run it as standalone, or connect it to one of their hardware emulators. Depending on what you need, you may not require actual hardware simulation. A lot of times, you can just step through the code on-screen.

You'll have to select a "close" match to the 89S52, but that should be too difficult as the S52 is a pretty generic 8051 with the SRF's in all the usual places.

-mpm

Hey, you could go massively parallel and make the next Commodore 1024!