Do you have a schematic for a homemade programmer for the HCS12 Freescale?

Question

Electronics

I can't find anything simple.
The task is to get into the processor on the device, there is a Gromov programmer, there is a separate one for the AVR, but neither in the documentation
nor on the Internet can I find how to properly connect the HCS12 microcontroller to rs232 and what software to use.
Maybe someone has experience.
Do not offer expensive programmers - it's not interesting like that.