Binary, BCD, Counter ???

Dec 23, 2005 3 Replies
P

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.


Vote
Twitter Facebook LinkedIn
S

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

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.

Best regards, Spehro Pefhany

"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Vote
Twitter Facebook LinkedIn
D

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

Dave

Vote
Twitter Facebook LinkedIn
J

Google for '8255' ...

Get the data sheet, read it. Have a look at:

formatting link

grtnx /jan

"Phld" schrieb im Newsbeitrag news: snipped-for-privacy@eclipse.net.uk...

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required