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

The SX 48 data sheet pecifies that for external clocks above 50 MHz, the oscillator setting should be OSCHS3, and the internal XTAL buffer should be disabled, i.e. bit 4, XTLBUF_EN in the FUSE register should be cleared. 

Try the DEVICE DRIVEOFF directive to see if this makes a difference. You may also try the DEVICE FEEDBACKOFF directive to de-activate the internal feedback resistor.

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