In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kingneb wrote:

Lets say I have data coming from an external source, such as a Parallal port or dip switches.  It is coming four bits at a time.  Four bits can only possibly be 0 to 15.  If I were to come out with an eight bit solution, I would have to add one four bit parallalel transmision to another.  Lets say those values are 8 and 12.  The parallel port outputs the number 8.  The microcontroller picks it up and waits for the next nibble.  Once it is sent, the microcontroller captures it.  After this is done, the microcontroller adds the two values together.  The process is repeated again if the nibble changes.

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