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

Hi all,

during a debugging session, the OSCx setting does not make any difference, as the device under test is always externally clocked from the SX-Key through the OSC1 pin with the internal clock oscillator turned off, as the OSC2 pin is required for the communication between the SX-Key and the SX under test.

When running stand-alone, it might be necessary to increase the internal oscillator driver gain by selecting a higher OSXxxx setting at lower supply voltages, but this also depends on the resonator/xtal type you are using. You also should consider selecting a higher gain in case the running system might be exposed to lower environmental temperatures.

Sorry, I forgot to mention the brownout setting before, because I thought this was obvious. No matter if you are debugging or run the chip stand-alone - you must always set the brownout level to a value lower than the supply voltage, or turn it completely off.

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