Searching \ for '[PIC]: 8bit Data bus using a PIC16F84A.. is it pos' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/memory.htm?key=data
Search entire site for: '8bit Data bus using a PIC16F84A.. is it pos'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]: 8bit Data bus using a PIC16F84A.. is it pos'
2001\05\29@043626 by Dylan Hillier

flavicon
face
<sorry, forgot to put a subject.. haaahaahaha.>

Hola People,

I am looking for a document or website with info on it that will tell me
how to hookup an 8 bit data bus with an  address bus and control bus using
a PIC MCU.

Im hoping to use a PIC16F84A to do this with PortA as the address/control
bus and port B as the data bus.
I would like to ability to control up to 8 devices using the bus by simlpy
connecting them to the bus, much the same way as you would with an Device
Card in an ISA bus on a 'old school' PC.

Any ideas on this would be of great help...

Many thanks...

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\05\29@064049 by Vasile Surducan

flavicon
face
On Tue, 29 May 2001, Dylan Hillier wrote:

> <sorry, forgot to put a subject.. haaahaahaha.>
>
 don't laugh please, James will be angry...


>
> Im hoping to use a PIC16F84A to do this with PortA as the address/control
> bus and port B as the data bus.
> I would like to ability to control up to 8 devices using the bus by simlpy
> connecting them to the bus, much the same way as you would with an Device
> Card in an ISA bus on a 'old school' PC.
>
 Prototype reserved area for standard PC is 300H...31FH.
You need some requirements:
-- highZ for data signals
-- address decoding pins, I think you can't do a full decode selection
  only with porta
-- WR and RD signals
-- no interrupts ?
-- ISA bus frequency less than 8MHz ( available in old PC ) or a good
software and 40Mhz pic

I think there are other pic microcontrollers which will fit better your
requirements.

Vasile

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\05\29@065504 by Jim Robertson

flavicon
face
At 01:40 PM 29/05/01 +0300, you wrote:
{Quote hidden}

Yes, I agree. One option would be to use a 17Cxx chip and memory mapped
I/O. You could also wait for the Romless 18Cxx chip and do likewise.

I don't see that the '84 has enough I/O to do this comfortably.

-Jim



>
>--
>http://www.piclist.com hint: The PICList is archived three different
>ways.  See http://www.piclist.com/#archives for details.
>
>
>
NEWFOUND ELECTRONICS
spam_OUTnewfoundTakeThisOuTspampipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


2001\05\29@090325 by Andy N1YEW

picon face
sure it has enough pins ya just gotta use a 688 as a address comparator and
an 8 bit bus latch :-)

andrew -- i was gonna make a isa programmer but i shelved it
{Original Message removed}

2001\05\30@012306 by Vasile Surducan

flavicon
face
On Tue, 29 May 2001, Andy N1YEW wrote:

> sure it has enough pins ya just gotta use a 688 as a address comparator and
> an 8 bit bus latch :-)

Sorry, I miss the point, why to to with a pic when is much cheaper with
one address comparator or a gal16V8 for address decoding and an usual
ls245 or ls373. Or if you need more pins, a fast 8255.
Using pic16F84 and some other components have nonsens ( my opinion...)
See my site:
http://www.geocities.com/vsurducan/8255.htm
Vasile



>
> andrew -- i was gonna make a isa programmer but i shelved it
> {Original Message removed}


'[PIC]: 8bit Data bus using a PIC16F84A.. is it pos'
2001\06\05@102724 by James Newton
face picon face
Lack of a programmer for the GAL and lack of board space for the discreets. Also lack of local inventory for either.

James Newton (PICList Admin #3) .....jamesnewtonKILLspamspam@spam@piclist.com 1-619-652-0593


Vasile Surducan wrote on 01-5-29 22:29:

On Tue, 29 May 2001, Andy N1YEW wrote:

> sure it has enough pins ya just gotta use a 688 as a address comparator and  an 8 bit bus latch :-)

Sorry, I miss the point, why to to with a pic when is much cheaper with one address comparator or a gal16V8 for address decoding and an usual ls245 or ls373. Or if you need more pins, a fast 8255. Using pic16F84 and some other components have nonsens ( my opinion...) See my site:
http://www.geocities.com/vsurducan/8255.htm Vasile



>
> andrew -- i was gonna make a isa programmer but i shelved it
> {Original Message removed}

2001\06\05@113803 by James Paul

flavicon
face
Guys,

My 2 cents worth... It's been my experience that unless you use the
Zero Power (TM) GALS, the current demands of the GALs are much too
high, ie Several tens of milliamps.   A PIC will use just a few mA
if that much.   So, if your power budget is already being pushed to
the limit, I'd stay away from the GALs for this application.
Of course, the final decision is up to you.  Anyway, that's my
thoughts.

                                           Regards,

                                             Jim



On Tue, 05 June 2001, James Newton wrote:

{Quote hidden}

> > {Original Message removed}

More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...