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

Hi all,

one statement in Stef's initial post draws my attention: "When I run on the resonator it is starting but after a few minuts it is restarting, and so on."

When "restarting" means that the SX performs a reset, and then runs the program again, the resonator, or the clock generation in general may not be the reason for this behavior.

What about the /MCLR pin - is it pulled up to Vdd with a resistor (4.7 to 10 kOhm are common values). Are there other components that might cause /MCLR going low (a short spike would be enough) to cause a reset?

Is the Watchdog timer active in the application, and if yes, is a clr !WDT instruction executed often enough?

Are there any conditional skips in the application reading input pins, and is it sure that those input pins don't float?

Attaching the SX-Key to the target SX dramatically changes capacitive loads and impedances in the system which means that a system might really behave well as long as the Key is connected, and go bananas when left alone with a resonator.

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