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

I don't see the oscillator crystals in the design. The oscillator consists of the inverter inside the chip, the Crystal PLUS external capacitance .  The extrernal capacitance adjusts the phase shift of the network to allow oscillation.  No caps, unruly oscillator.  You should try using between 22pf to 40pf from each pin of the crystal to GND to get reliable clock.

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