/**
  \example speed2.cpp 

  This sketch sets up the processor speed based on a value read from
  EEPROM.

  To avoid a blink code, the sketch ensures the mhz value is in the
  range of 12..72, before passing it to SFBProcessor::setMHz(), but
  note that only multiples of 12MHz are supported.  If an 's32'
  packet, say, is handled by this sketch, the processor speed after
  rebooting will not be 32MHz, but 24MHz --- the next lower multiple
  of 12MHz.

 */
