Binary, BCD, Counter ???


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!



Reply to
Loading thread data ...

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"             Info for manufacturers:
 Click to see the full signature
Reply to
Spehro Pefhany

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


Reply to

Google for '8255' ...

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

formatting link

grtnx /jan

"Phld" schrieb im Newsbeitrag news:

Reply to
Jan Homuth

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.