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

The internal oscillator is 4 MHz. 
To use 50MHz (as specified by freq in your program) you need an external resonator.

I use the following for 50MHz resonator:

device  SX28,oschs1,turbo,stackx,optionx ;sx device options
irc_cal  IRC_SLOW
freq  50_000_000


regards peter

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