Dallas one-wire interface

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Dallas One-Wire low-level and high-level interface. The technique to address the physical I/O pins is tailored to the Oak Micros OM128 device, but more standard pin addressing can substituted easily. The timing was carefully measured to meet the 1-wire standard. Changes to the pin addressing may change the speed (probably ending up slightly faster), and this could affect the most time-critical functions.

Also, it is tailored for 14.7MHz, but there are comments on the clock counts for certain sections so that macros could be added to calculate the actual times.

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