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Your HCS12DP512 MCU has 512K of FLASH but with the serial bootloader you are limited to ppages $3E and $3F at a
maximum download speed of 9600 Baud. With a serial POD that connects directly to the 10-pin Universal BDM connector
on most MCU boards, you can download to the whole FLASH at up to 115200 Baud. And no need either to set the [P0, P1]
Mode Select switches. Best of all, you don't have to patch any .S19 file; just erase and download with D-BUG12.
www.technologicalarts.ca sells a BDM pod based on Freescale's D-Bug12, running in Pod Mode, that uses USB port. Other vendors undoubtedly sell a similar product.