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

You can't use the internal clock source for serial comms -- it's not accurate enough.

And I know it sounds funny to say, but you're using old fashioned SX/B syntax.  RX_BYTE should be a function declared like this:

[code]RX_BYTE		FUNC    1, 0[/code]
... and coded like this:

[code]FUNC RX_BYTE
  SERIN Sio, Baud, __PARAM1
  ENDFUNC[/code]
Since __PARAM1 is used to return a byte from a function we can use it to receive the serial byte (I've looked inside the SERIN code so I know this is okay).

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