All SAM E70/S70/V70/V71 devices feature nine general-purpose NVM (GPNVM) bits that can be cleared or set, through the “Clear GPNVM Bit” and “Set GPNVM Bit” commands of the EEFC User Interface.
The GPNVM0 bit is the security bit.
The GPNVM1bit is used to select the Boot mode (Boot always at 0x00) on ROM or Flash.
| GPNVM Bit | Function |
|---|---|
| 0 | Security bit |
| 1 | Boot mode selection 0: ROM (default) 1: Flash |
| 5:2 | Free |
| 6 | Reserved |
| 8:7 | TCM configuration 00: 0 Kbytes DTCM + 0 Kbytes ITCM (default) 01: 32 Kbytes DTCM + 32 Kbytes ITCM 10: 64 Kbytes DTCM + 64 Kbytes ITCM 11: 128 Kbytes DTCM + 128 Kbytes ITCM Note: After programming, reboot must be done.
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