>Set value of integer register</TD></TR>
<TR><TD>1</TD><TD>none</TD><TD>Read value of integer register</TD></TR>
<TR><TD>2</TD><TD>vdata</TD><TD>Take action unrelated to registers</TD></TR>
<TR><TD>3</TD><TD>vdata</TD><TD>Set value of vdata register</TD></TR>
<TR><TD>4</TD><TD>none</TD><TD>Read value of vdata register</TD></TR>
</TABLE>

<P>
Commands 0 and 3 are replied with a single ACK 0x06.  Command 2 is
replied with an ACK 0x06 followed by an "action complete" notifier
0x05.  Commands 1 and 4 