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

I can think of a way and the DTMFing is probably all it'll be doing, can't/won't say for sure at this point.  [Strobe data for me, baby.]  I need to use an op-amp and some resistors, too.  It'll be "square waves" out.  

Don't worry, John Couture, because you can still help with the INTERRUPT.

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