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

You need to move the "PROGRAM Start" line below the interrupt routine. (Right after RETURNINT would be fine).

The PROGRAM command generates the startup code (even with the NOSTARTUP parameter, there is still a bit of startup code needed).

Another suggestion is that SEROUT will not be reliable with the internal 4MHz clock. It's just not stable enough.

The next version of the compiler actually gives a warning if you use SEROUT or SERIN with the internal clock.

Bean.

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