I thought that a PIC runs at micro second speed. I thought that a loop clean through all my code would be indistinguishable by my human eyes.
The SRF05 have little red lights that flash each time they are pulsed. While the PIC is running the little flashes come about one per second.

How can that be? What is consuming the time?

Where can I get some information about the relation between PBP commands and real 16RF887 machine language code?

Ken