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

Sergio,

IMO, it is not necessary to use a VP for I²C communication, as there is no exact SCL frequency required. You can even realize a Master/Slave configuration. In my book, I have described a system where two or more components on the I²C bus can act as masters, e.g. the main controller, and a push-button unit, and a potentiometer unit.

For the UART, you should use a VP, as timing is critical. When you only need a transmitter, baud rates up to 9600 will be no problem at 4 MHz clock, provided you are using an external crystal or resonator, as the SX-internel RC clock is not stable enough.

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