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

The FREQ Directive establishes the reference for time_base (crystal, et al.), letting the SX know what rate it has coming in, very important for time-sensitive tasks.

4MHz, 5MHz, that's all cool (hi_hi), just get it right with the FREQ Directive.  The higher the FREQ, the hotter the SX (potentially) will run.  One SX can be on a 4MHz and another on a 10MHz and they can exchange serial data and that like.

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