CAPT OF A B737-400 MISUNDERSTOOD TWR CTLR INSTRUCTIONS BY TURNING OFF THE RWY INSTEAD OF TAXIING INTO POS AND HOLDING. CAPT TOLD TWR THAT HE NEEDED A 30 SECOND DELAY SO TWR INSTRUCTED HIM INTO POS AND IF MORE TIME WAS NEEDED HE COULD TAXI OFF AND FALL BEHIND THE NEXT IN LINE WAITING. AFTER TWR ASKED HIM WHERE RPTR WAS GOING; TWR THEN RECLRED HIM ACCORDINGLY.

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UPON ARRIVING AT THE END OF RWY 36R IN CLT WE HAD NOT RECEIVED OUR WT AND BAL NUMBERS. I TOLD TWR THAT WE NEEDED 30 SECONDS OR SO BEFORE WE TOOK THE RWY. HE SAID 'TAXI INTO POS AND HOLD.' AS WE WERE TAXIING ONTO RWY THE CTLR SAID; 'IF YOU NEED MORE THAN 30 SECONDS YOU WILL NEED TO LOOP AROUND AND FALL IN BEHIND DEPARTING TFC.' AS WE TAXIED ONTO THE RWY THE NUMBERS STILL HAD NOT COME. I REALIZED WE WERE GOING TO BE LONGER THAN 30 SECONDS; SO I BEGAN TO MOVE TOWARD THE FIRST INTXN TO CLR THE RWY. THE CTLR ASKED WHAT WE WERE DOING AND I SAID WE WERE CLRING THE RWY AND LOOPING BACK IN TO JOIN BEHIND DEPARTING TFC. THE CTLR SAID; 'I SAID TAXI INTO POS AND HOLD.' THEN HE SAID; 'GO AHEAD AND JOIN THE TXWY BEHIND THE COMMUTER;' AND WE DID. NEEDLESS TO SAY WE MISUNDERSTOOD THE INTENT OF THE CTLR. FO WAS ON THE COMPANY RADIO TRYING TO GET OUR NUMBERS. I HEARD WHAT I THOUGHT WERE INSTRUCTIONS THAT EVIDENTLY WEREN'T INTENDED BY THE CTLR. SINCE WE WERE NOT READY FOR TKOF WE SHOULD NOT HAVE BEEN CLRED ONTO THE RWY. BREAKDOWN IN COM.