7.4 Backup SRAM Power Switch

The SAM E70/S70/V70/V71 embeds a power switch to supply the 1 Kbyte of backup SRAM. It is activated only when VDDCORE is switched off to ensure retention of the contents of the backup SRAM. When VDDCORE is switched on, the backup SRAM is powered with VDDCORE.

To save the power consumption of the backup SRAM, the user can disable the backup SRAM power switch by clearing the bit SRAMON in the Supply Controller Mode Register (SUPC_MR). By default, after VDDIO rises, the backup SRAM power switch is enabled.