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

Hi Stef,

using the internal 4 MHz clock for serial communications applications is not a good idea because this internal clock is not very precise, and not stable. So even if you manage to have SXWIZ generate code for 9600 Baud, the communications would not work reliably. Therefore, you better use an external resonator as Peter suggested.

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