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

I've been writing a lot of ISR based UART code lately and using the ISR to handle delays as well.   Since a lot of ISR code is not executed on every pass I wouldn't get overly concerned; there are old demos from Scenix that have boatloads of VPs jammed into the ISR.  

Since I2C is a synchronous protocol you can use the built-in I2C commands; you just need to make sure that you're not using the NOPRESERVE or NOCODE options with INTERRUPT.

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