Hello everyone..

I am getting ready to start my diploma degree project that will be using many 80
51 based systems
connected to an RS-485 network, an 8051 or 80251 based server with a connection
to a PC. Could
any one help me out ??

> Yeah!

1. I wish to use an RS-485 full duplex network with bus topology in order to con
nect many 8951
based systems. My number one problem is what driver circuit should i use. I am l
ooking for
something with 3 or 4 channels (from the system's side) that also carries a filt
er. The third
channel will be used as an attempt to achieve CSMA/CD. Is there a way i can find
 an IC that can
provide me with the CSMA/CD and also using the serial port on the 8951 ?? I wish
 to use it for up
to 38,400bps transfer speed.

> I know that Intel has the 80C152A microcontroller with embedded CSMA/CD

2. Where can i find an RTC that can support an mcu with a clock of 16MHz or 24MH
z. The only one
that i have found that appears to be really good is an EPSON 6581 that also has
a battery holder
on it, with 114bytes on NV RAM.

>Dallas has good RTC, inclusive that works as a memory!

3. Can the SED1330 by EPSON drive an 640x480 monochrome LCD panel ?? Is there a
panel and
driver/controller set that you can suggest me ??

>Explain the SED1330

4. I wish to use the Philips 8554 I2C bus controller with an EEPROM chip. Do i h
ave to use
addresses or i can just use it as is ??

> You must see if this IC has a CHIP SELECT pin!

5. Is there an IC or a circuit that i can use to interface a 4x4 matrix keyboard
 ?? It should
handle key scanning, debouncing and coding plus interrupting the microcontroller
 for it to
receive the key-code from a on-circuit register.

>74922

If you can answer to any of these questions please do so.
There is no need to answer to all of them.

> :)

Thank you for the time you spent reading this mail message.


> No problem, i think that you will get all the answers fastly!

> mIGUEL wISINTAINER
> REAL REMOTE EXPERIMENT WITH 8051

With regards,

Panos Kenterlis
Technological and Educational Institute of Piraeus (BSc student)
Athens - Piraeus
Greece