SPMS444B "Tiva TM4C129XNCZAD Microcontroller Data Sheet" Fig. A.1 "Key to Part Numbers" shows this format for TM4C129 part numbers:
T M4 C 1 SSS M Y PPP T Z R, where SSS = Series Identifier.
The first 2 digits of SSS appear to always be 29. Please provide a list of definitions for the third letter/digit of SSS. The pinmux utility lists these options but doesn't define them: 0,2,4,7,9,C,D,E,L,X.
