Re: Wanted: 80C51-based MCU

On Dec 3, 12:25�am, Robert Baer <robertb...@xxxxxxxxxxxx> wrote:
� �Must have 4 bytes (32 pins) I/O.
� �Must have internal UART for serial I/O; serial input either at a pin
or programmable to one of the I/O pins and serial output either at a pin
or programmable to one of the I/O pins.
� �EPROM for the instructions.
� �ASM "compiler".
� �Relatively inexpensive "emulator"/programmer for trying out programs
on a real device.
� �Relatively inexpensive MCU, can operate from color crystal to (say)
20Mhz crystal.
� �Must be current production part with good expectation that it will be
around for the next 5-20 years, as i hate to re-do the project every 1-3
years.

� �Suggestions?

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
.

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