Backup RAM (SRAM)

Enabling Backup RAM (SRAM)

FEATURE_RETAINED_MEMORY

Backup RAM is disabled by default, since it does require some maintenance power which may not be desired on some low-powered projects. Backup RAM consumes roughly 5uA or less on VIN and 9uA or less on VBAT.

Backup RAM is enabled with this code in setup():

void setup() 
{
  System.enableFeature(FEATURE_RETAINED_MEMORY));
}