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

Stef,

your teacher was absolutely right - never let inputs float - pull them up or down accordingly. In case of /MCLR you MUST pull it up, otherwise the device might perform uncontrolled resets.

Good to hear that the 5 pF cap from OSC2 to Gnd did the job. As there are resonators available with and without integrated capacitors, you can't say that the cap and the 10 kOhm resiostor are always required. Nevertheless, it is a good idea to provide pads on the PCB for those components, just in case you might need them.

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