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

clocks/resonators/crystals --

The SX can run off of an external clock source attached to OSC1 and OSC2. There are a variety of components for clocks, the easiest to use being the resonators sold by Parallax.

Now, with an SX-Key connected, the Key itself can be the clock source (pull your resonator/crystal/oscillator when doing this).

The "internal" 4MHZ clock is dandy for a lower component count and for applications that don't need higher speeds BUT (and this is a big but) the ACCURACY of the internal clock is not that great (I believe around +/- 8%, but Bean can probably correct me on this). For many applications this not necessarily a problem, but for any truly time-sensitive operations (like serial communication) it may not provide accurate enough clocking.

Short version for your code -- EITHER use an external resonator (say 20MHZ) and change your freq directives accordingly, OR use the SX-Key generated clock (in other words, leave the Key connected when running your app).

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