Binary, BCD, Counter ???

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Phld Contact options for registered users 's Avatar (by Gravatar) posted on
December 23, 2005, 3:25 pm
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Hi,

I'm currently working on a project where I'm running out of pins on a
PIC.  This is one of the bigger PICS so I am unable to expand on the
processor.  Basically I need to be able to signal 8 outputs from a
single pin on the PIC.  This is what I need in a nutshell:

Pulse on a single pin from the PIC to set a number of outputs (upto 8+)
Once set pulse another pin to enable the selected outputs.
Have the ability to reset the chip.
Be able to set all 8 (or more) outputs indipendantely.

Does anyone know of such a chip?

Please excuse my lack of electronics speak.  I'm new to electronics!

TIA

Phil.

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Spehro Pefhany Contact options for registered users 's Avatar (by Gravatar) posted on
December 23, 2005, 5:07 pm
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Re: Binary, BCD, Counter ???


On Fri, 23 Dec 2005 15:25:26 +0000, the renowned Phld

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So, you've used up all 68~70 I/O pins on an 18F8x20 or dsPIC30F?

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Not precisely, not offhand. Normally I'd use several pins to control
an inexpensive HCMOS buffered shift register. In rare cases maybe even
another micro (which could use a single pin if you came up with an
appropriate protocol). If I didn't care about price or availability I
might consider a DS2408, but that would be a chilly day in Hades.  

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Best regards,
Spehro Pefhany
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Dave Contact options for registered users 's Avatar (by Gravatar) posted on
December 23, 2005, 8:29 pm
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Re: Binary, BCD, Counter ???



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It sounds like the 74HC595 is close to what you're looking for.

Dave



Jan Homuth Contact options for registered users 's Avatar (by Gravatar) posted on
January 3, 2006, 7:48 am
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Re: Binary, BCD, Counter ???


Google for '8255' ...

Get the data sheet, read it.
Have a look at: http://www.boondog.com/%5Ctutorials%5C8255%5C8255.htm

grtnx
/jan


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