Combine cornstarch, cinnamon, salt in small saucepan. Stir in orange juice and cranberry sauce. Cook and stir over medium heat until thickened. Set aside.
Place pork in shallow pan and spoon over about 1/2 cup cranberry sauce.
Roast in a 350 degree F. oven for 40-60 minutes to an hour (20 minutes per pound), basting occasionally with additional sauce, until internal temperature on a thermometer reads 145 degrees F. Remove roast from oven; let rest about 10 minutes before carving. Serve with additional cranberry sauce.