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

You have mentioned many times that you're trying to keep to bytes -- does that include RPM?  One would assume a practical value is RPM/100 -- if that's the case see the attached program.  It simply counts the 0->1 transitions on the TachIn pin for 0.6 seconds and then updates a program variable called rpm.  This happens in the ISR which means you don't have to do anything.  Use the ISR means you can have background serial, too.

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