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

[quote="Bean (Hitt Consulting)"]Also you cannot do serial communication using the internal 4MHz oscillator. It is not accurate enough. You need to use a resonator.[/quote]

Bean,

Is there a particualar reason this adversely affects the SX? It's possible to do serial communications with the internal oscillator of pretty much any other major microcontroller family. While I understand that the SX needs to use a software UART implementation, I can't see any reason why the SX should have issues at even 19,200 baud, where it has over 200 cycles between outputs.

I'd make an educated guess that this because the SX ships without it's internal oscillator trimming? (Sorry, can't check this theory with the datasheet at the moment)

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