Creating programm for NEC 78K

Hello.
I dont know German so well so i will write this in English.
Am sorry for that. This is the only forum that i have found regarding 
NEC.

I want to make signal analyzer on the way that i can define multiple 
signals.
The signal frame is constant and it contains checksums and other bits.

What is the easiest way to write such program in IAR for 78K ?
How to define pseudo code for such program ?


Alan