15.4.9 Backup Domain IO Isolation

If VDD3V3 is removed when the device is in Backup mode, isolation must be enabled (SUPC_MR.IO_BACKUP_ISO=0) before entering Backup mode and must disabled (SUPC_MR.IO_BACKUP_ISO=1) after a wake-up from Backup mode. If VDD3V3 is not removed when the device is in Backup mode, SUPC_MR.IO_BACKUP_ISO must be kept at ‘1’.

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