def _address_byte(self, read=True):
if read:<EOL><INDENT>return (self._address << <NUM_LIT:1>) | <NUM_LIT><EOL><DEDENT>else:<EOL><INDENT>return self._address << <NUM_LIT:1><EOL><DEDENT>
Return the address byte with the specified R/W bit set.  If read is
        True the R/W bit will be 1, otherwise the R/W bit will be 0.