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      The BIO pin is useful for monitoring peripheral device status. It
      is especially useful as an alternative to using an interrupt when
      it is necessary not to disturb time-critical loops. When the
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      BIO pin is active (low), execution of the BIOZ instruction causes
      a branch to occur.

      Because of variations in pipelining due to instructions prior to and
      following the BIOZ instruction, it is recommended that several
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      cycles of setup be provided if BIO is to be recognized on a
      particular cycle.