In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

Ray,

Have you considered the run rate differences between the UART and SIRCS ISRs?  The UART code specifies an interrupt run rate of 4.34 uS.  The SIRCS ISR code from Jon Williams specifies a run rate of 26 uS.

If you have not already considered this you may want to adjust the run rate of the SIRCS code.  (26 uS) / (4.34 uS) = 5.99.  So you should call the SIRCS code once for every six times the ISR is processed.

Maybe this will help.

 - Sparks

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