diff --git a/demos/ATSAMA5D2/RT-SAMA5D2-XPLAINED-LWIP/cfg/chconf.h b/demos/ATSAMA5D2/RT-SAMA5D2-XPLAINED-LWIP/cfg/chconf.h
index 8093b6f33..e08a34ce7 100644
--- a/demos/ATSAMA5D2/RT-SAMA5D2-XPLAINED-LWIP/cfg/chconf.h
+++ b/demos/ATSAMA5D2/RT-SAMA5D2-XPLAINED-LWIP/cfg/chconf.h
@@ -49,7 +49,8 @@
  * @details Frequency of the system timer that drives the system ticks. This
  *          setting also defines the system tick time unit.
  */
-#define CH_CFG_ST_FREQUENCY                 1000
+#define CH_CFG_ST_FREQUENCY                 1000              /* periodic tick. */
+//#define CH_CFG_ST_FREQUENCY                 (83000000 / 32) /* tick-less. */
 
 /**
  * @brief   Time intervals data size.