Ralph,

You really need to learn more about the parts you're trying to use. First of all, you must know how microcontrollers work. Then, you must know how the specific peripheral you intend to use works. Put an emphasis on items such as timing, current, and voltage. If you meet all the required constraints of the peripheral and don't violate any constraints of your MCU, things will work, provided, of course, you've coded the MCU correctly.

The key is in knowing where you want to go and knowing how to get there.

RE