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

Ray,

As you know, SHIFTIN and SHIFTOUT will cover most applications; if you're after more it's a pretty simple matter to craft it in code.  There won't be any changes to SX/B that affect SHIFTIN and SHIFOUT, so you may want to develop something specific for your application.  I did this for a Sony PlayStation controller project -- it uses and SPI type protocol where bits are shifted in and out at the same time.  There code was very simple to implement (I had even done it on a BASIC Stamp) and the project works well.

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