Hi

I think this project is helpful to expand unlimited output by just three pins of any type of MCU

one application of this example is to control 7-segment with no refreshing and LEDs are high light and static view

In this project i used PIC12F675 to Expand outputs to 24 pins by Proton Compiler

Code:

Device = 12F675
Xtal = 4
Config no_mclre
All_Digital = On
TRISIO = 0
GPIO = 0
Symbol CP = GPIO.0
Symbol D = GPIO.1
Symbol LE = GPIO.2
Dim i As Byte
Dim o[3] As Byte
Clear
For i = 0 To 2 ' write 1 2 3 to the array
o[i] = i + 1
Next i

Main:
SHOut D,CP,1,[o[2]\8, o[1]\8, o[0]\8]
High LE : DelayUS 1 : Low LE
DelayMS 500
For i = 0 To 2 ' write the array
o[i] = o[i] + 1
Next i
GoTo Main


Schematic:


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