code: def instruction_ST16(self, opcode, ea, register):
          
          value = register.value
  #        log.debug("$%x ST16 store value $%x from %s at $%x \t| %s" % (
  #             self.program_counter,
  #             value, register.name, ea,
  #             self.cfg.mem_info.get_shortest(ea)
  #         ))
          self.clear_NZV()
          self.update_NZ_16(value)
          return ea, value
docs: Writes the contents of a 16-bit register into two consecutive memory
          locations.
  
          source code forms: STD P; STX P; STY P; STS P; STU P
  
          CC bits "HNZVC": -aa0-