Hi Dave!
You are correct it can be confusing. There are things being done that seem to make no sense such as what appears to be using XT for the crystal when I am used to using HS for a 20 MHz crystal. Some expressions are not so difficult to understand such as HSPLL (High Speed Phase Locked Loop). If is not asking too much it would be interesting and educational to know step by step what code you would use and why say for the 1320.

Thnaks, Ed