Hi Chang,
56800E Flash Programmer only works for 56800E, and it doesn't not support 56800 product.
To program DSP56F803, please use CodeWarrior, or flash_over_jtag.
CodeWarrior v8.3 can be downloaded from:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=CW-56800E-DSC
It supports programming with USBTAP and Parallel.
flash_over_jtag is a command-line tool, however it does not support USBTAP.
Hope it helps! If not, please contact me again. I will be very glad to help you.
Regards,