Re: Wanted: 80C51-based MCU

On Dec 4, 6:27 am, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:
terrypolt...@xxxxxxxxxxx wrote:
On Dec 3, 3:25 pm, 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?

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
terrypolt...@xxxxxxxxxxxx P.S. I have an 8031 chip and a 8255 chip.

If you use external ROM you lose 2 bytes of I/O. Hence the need to make it up
with the 8255.

Far better to use a chip like those I suggested with internal flash code
memory. Then all 4 ports are available for your own use. Probably cheaper too
by quite a bit.

Graham- Hide quoted text -

- Show quoted text -

And you do your development on an Oki 85C154 attached to a romulator
(that way
you don't loose any port pins)
M
.

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