REX_P1REG_VC1_ADDRDATA
rex_read(dc, REX_PAGE1_GO, REX_P1REG_VC1_ADDRDATA);
return (rex_read(dc, REX_PAGE1_SET, REX_P1REG_VC1_ADDRDATA));
rex_write(dc, REX_PAGE1_SET, REX_P1REG_VC1_ADDRDATA, val);
rex_write(dc, REX_PAGE1_GO, REX_P1REG_VC1_ADDRDATA, val);