WHILE TAXIING AFTER LNDG; PLT OF SR22 MIS HEARS HOLD SHORT CLRNC DUE TO SIMULTANEOUS COLLISION AVOIDANCE SYS ALERT. ASSUMES THE CLRNC WAS TO CROSS THE RWY. RWY INCURSION AND POTENTIAL LOSS OF SEPARATION WITH DEPARTING ACFT RESULTS.

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AFTER LNDG ON RWY 27 AT FPR; I EXITED A2 AND CONTACTED GND AS INSTRUCTED BY THE TWR. DURING GND'S XMISSION; THE TCAS ALERT (TFC; TFC) SOUNDED. THINKING I HAD HEARD AND UNDERSTOOD THE INSTRUCTIONS; I READ BACK 'TAXI ALPHA; CROSS RWY 32; TO THE RAMP.' JUST AFTER XING THE HOLD LINE AT RWY 32; I SAW AN ACFT LIFTING OFF RWY 32 TO MY L; AT THE SAME TIME; GND CALLED 'STOP;' AND INFORMED ME I WAS 'TOLD TO HOLD AT RWY 32 AND THAT'S WHERE I WAS.' THE DEPARTING ACFT PASSED WELL IN FRONT OF ME AND AT LEAST 100 FT ABOVE. I CALLED GND TO TELL THEM I HAD UNDERSTOOD AND READ BACK CROSS RWY 32; NOT HOLD. GND CLRED ME TO TAXI TO THE RAMP. IN RETROSPECT; I BELIEVE WHEN GND'S XMISSION WAS STEPPED ON BY THE TCAS ALERT; I 'FILLED-IN' WITH WHAT I EXPECTED TO HEAR -- THINKING THE READBACK WOULD CATCH ANY ERROR. WHAT I WILL TAKE AWAY FROM THIS INCIDENT: 1) IF THE TCAS ALERTS WHILE RECEIVING INSTRUCTIONS; I WILL ASK FOR A REPEAT AND NOT TRUST A READBACK TO CATCH ANY ERRORS. 2) I WILL ALWAYS CHK BEFORE XING RWY HOLD LINES -- REGARDLESS OF WHAT CLRNC HAS BEEN GIVEN. 3) I WILL SEE IF THERE IS AN APPROVED MODIFICATION TO THE TCAS SYS THAT WILL TURN THE AUDIO PORTION OFF WHEN ON THE GND (FULL FLAP DEPLOYMENT SINCE THE GEAR IS FIXED). (I UNDERSTOOD NEWER MODELS ALLOW FOR MANUAL DISABLING OF TCAS.)