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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/13990#discussion_r420008942">sys/include/ztimer/config.h</a>:</p>
<pre style='color:#555'>> + *
+ * When scheduling an ISR every timer will be set to max("min", value).
+ *
+ * This is supposed to be defined per-device in e.g., board.h.
+ */
+#ifndef CONFIG_ZTIMER_USEC_MIN
+#define CONFIG_ZTIMER_USEC_MIN          (10)
+#endif
+
+/**
+ * @brief   ZTIMER_USEC base timer width
+ */
+#ifndef CONFIG_ZTIMER_USEC_WIDTH
+#  if (TIMER_0_MAX_VALUE) == 0xFFFF
+#    define CONFIG_ZTIMER_USEC_WIDTH        (16)
+#    define XTIMER_WIDTH (24)
</pre>
<p>copy pasta</p>

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