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

I'm building an LCD serial adapter similar to the parallax sx/b serial LCD example but with the sx20 chip. My question is do I need an external crystal or resonator for this? or can I get away with using the internal resonator at 4mhz? the example i have seen use external 4mhz resonators, is the internal 4mhz resonator not acurate enugh for serial comunication?

Owen

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