Novel technique using one pin with shift registers - DATA & CLK (by Leon)
Cluso99
Posts: 18,069
I saw this post by Leon (in the Sandbox) and thought I would bring it to the prop forum where we are always looking for ways to save pins. Thanks Leon and others 
·· http://forums.parallax.com/showthread.php?p=859619
Here are some links from that thread...
www.romanblack.com/shift1.htm
www.edn.com/contents/images/6598372.pdf
and PhiPi's circuit to give you an idea of what possibilities this has
Possible uses (are any of these possible???)....
Certainly access will be slower, but sometimes that does not matter and if there are not the spare pins - well no alternative really.
Can anyone get a PS2 Keyboard working using 1 pin ??? Is it possible (I haven't looked at the protocol) ??? I was going to use a PIC10F2xx or MC9RS08KAx (SOT23-6 or SOIC8) to convert a PS2 Keyboard to 1 pin serial, but this would be much simpler
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)
· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm
·· http://forums.parallax.com/showthread.php?p=859619Here are some links from that thread...
www.romanblack.com/shift1.htm
www.edn.com/contents/images/6598372.pdf
and PhiPi's circuit to give you an idea of what possibilities this has
Possible uses (are any of these possible???)....
- I2C·devices ???
- SPI devices ???
- PS2 Keyboard ???
- Serial LCD (CLK & DATA) ??? (Peter has·a nice 128x64 LCD)
Certainly access will be slower, but sometimes that does not matter and if there are not the spare pins - well no alternative really.
Can anyone get a PS2 Keyboard working using 1 pin ??? Is it possible (I haven't looked at the protocol) ??? I was going to use a PIC10F2xx or MC9RS08KAx (SOT23-6 or SOIC8) to convert a PS2 Keyboard to 1 pin serial, but this would be much simpler
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)
· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm