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

No, not necessarily.

Jonny's attached code IS like "serin/serout" but in assembly and in the ISR. A few regular SX/B functions allow the main program to queue and de-queue the sent/received bytes. You can use those routines in the ISR and the functions in your main program w/o change (except for pin assignments, perhaps).

Why don't you attach your current working code? If your ISR is slow enough, it may be just easy to slip serial comm. in between interrupts as move material into the ISR.

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