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

When you download it you'll see that I "wired" it to your code so it should be easy to follow.  

There's no need to explain it -- I've just replaced SERIN with ISR code and used assembly for the display multiplexing to keep the ISR cleaner; in the end it's doing what you want but you don't have an ISR/SERIN conflict any more.  The nice thing about using ISR serial is that you can check the rxReady flag in the foreground and only call RX_BYTE when you have something waiting, otherwise RX_BYTE waits on something to show up (just like SERIN).

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