The TPI must be enabled before external programming mode can be entered. The
following procedure describes, how to enter the external programming mode after the TPI
has been enabled:
- 1.Make a request for enabling NVM programming by sending the NVM memory access key
with the SKEY instruction.
- 2.Poll the status of the NVMEN bit in TPISR until it has been set.
Refer to the Programming Interface description for more detailed information of
enabling the TPI and programming the NVM.