pt when bit 7 of <code class="computeroutput"><span class="identifier">zs</span><span class="special">.</span><span class="identifier">data_type</span></code>
          is set, in which case the number of unused bits will be less than eight.
          <code class="computeroutput"><span class="identifier">zs</span><span class="special">.</span><span class="identifier">data_type</span></code> is set as noted here every
          time <code class="computeroutput"><span class="identifier">write</span></code> re