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

The reason your original .src file did run is because of your device line settings:

[code]
	DEVICE  SX28, TURBO, STACKX, OSCHS2  ; oschs2 here tells the sx to look for a 20-50mhz clock source on osc1/osc2
	IRC_CAL IRC_FAST
	FREQ    4_000_000  ; this is a "convenience" -- what the clock does is what the sx will do when running "standalone"
                                     ; i.e. this doesn't actually affect how the clock interacts with the sx
[/code]

The run->device menus will do the same thing (change the fuse bits), but here is what you would do to run your .src program without the Key and without an external clock:


[code]
	DEVICE  SX28, TURBO, STACKX, OSC4MHZ  ; use internal 4mhz oscillator
	IRC_CAL IRC_4MHZ ; tune internal oscillator get as close to 4mhz as possible
	FREQ    4_000_000  
[/code]

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