20.2 Disabling a Module
A peripheral can be disabled by setting the corresponding peripheral disable bit in the PMDx register. Disabling a module has the following effects:
- The module is held in Reset and does not function
 - All the SFRs pertaining to that peripheral become
               “unimplemented”
- Writing is disabled
 - Reading returns 
0x00 
 - Module outputs are disabled
 
