<p></p>
<p><b>@fabian18</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16870#discussion_r715009006">cpu/stm32/include/periph_cpu.h</a>:</p>
<pre style='color:#555'>> +void backup_ram_init(void);
+
+/**
+ * @brief   Check whether the backup RAM regulator is on and backup RAM
+ *          content is retained while asleep
+ */
+bool backup_ram_is_retained(void);
+
+/**
+ * @brief   Enable the backup RAM regulator to retain it´s content
+ *          during standby mode
+ */
+void backup_ram_sleep(void);
+
+/**
+ * @brief   Disable the backup RAM regulator
</pre>
<p>I will also remeasure with a multimeter as soon I have one at hand.</p>

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