19.5.3.3.2.1 SRAM Automatic Low-Power Mode

The SRAM is by default put in Low-Power mode (back-biased) if the device is in Standby Sleep mode. As a consequence, the DMAC cannot access it during Standby mode.

This behavior can be changed by configuring the Back Bias bit in the Standby Configuration register (STDBYCFG.BBIASHS), refer to the table below for details.