diff --git a/boards/arm/sama5/jupiter-nano/include/board_384mhz.h b/boards/arm/sama5/jupiter-nano/include/board_384mhz.h
index 05b7c359aab..78f313c08dc 100644
--- a/boards/arm/sama5/jupiter-nano/include/board_384mhz.h
+++ b/boards/arm/sama5/jupiter-nano/include/board_384mhz.h
@@ -102,7 +102,7 @@
  *
  * "The USB Host controller requires 48 MHz and 12 MHz clocks for OHCI
  *  full-speed operations. These clocks must be generated by a PLL with a
- *  correct accuracy of ± 0.25% thanks to USBDIV field.
+ *  correct accuracy of +/- 0.25% thanks to USBDIV field.
  *
  * "Thus the USB Host peripheral receives three clocks from the Power
  *  Management Controller (PMC): the Peripheral Clock (MCK domain), the
@@ -142,7 +142,7 @@
 
 #define BOARD_ADC_PRESCAL          (7)
 #define BOARD_TSD_STARTUP          (40)        /* 40 nanoseconds */
-#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1µs at 8MHz */
+#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1us at 8MHz */
 #define BOARD_TSD_DEBOUNCE         (10000000)  /* 10 milliseconds (units nanoseconds) */
 
 /* Resulting frequencies */
diff --git a/boards/arm/sama5/jupiter-nano/include/board_396mhz.h b/boards/arm/sama5/jupiter-nano/include/board_396mhz.h
index c55dd529600..e917ab8e151 100644
--- a/boards/arm/sama5/jupiter-nano/include/board_396mhz.h
+++ b/boards/arm/sama5/jupiter-nano/include/board_396mhz.h
@@ -98,7 +98,7 @@
 
 #define BOARD_ADC_PRESCAL          (7)
 #define BOARD_TSD_STARTUP          (40)        /* 40 nanoseconds */
-#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1µs at 8MHz */
+#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1us at 8MHz */
 #define BOARD_TSD_DEBOUNCE         (10000000)  /* 10 milliseconds (units nanoseconds) */
 
 /* Resulting frequencies */
diff --git a/boards/arm/sama5/jupiter-nano/include/board_528mhz.h b/boards/arm/sama5/jupiter-nano/include/board_528mhz.h
index cffdff93b8f..fab94f1baee 100644
--- a/boards/arm/sama5/jupiter-nano/include/board_528mhz.h
+++ b/boards/arm/sama5/jupiter-nano/include/board_528mhz.h
@@ -97,7 +97,7 @@
 
 #define BOARD_ADC_PRESCAL          (7)
 #define BOARD_TSD_STARTUP          (40)        /* 40 nanoseconds */
-#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1µs at 8MHz */
+#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1us at 8MHz */
 #define BOARD_TSD_DEBOUNCE         (10000000)  /* 10 milliseconds (units nanoseconds) */
 
 /* Resulting frequencies */
diff --git a/boards/arm/sama5/jupiter-nano/include/board_sdram.h b/boards/arm/sama5/jupiter-nano/include/board_sdram.h
index f7513af2809..dc75541158a 100644
--- a/boards/arm/sama5/jupiter-nano/include/board_sdram.h
+++ b/boards/arm/sama5/jupiter-nano/include/board_sdram.h
@@ -107,7 +107,7 @@
 
 #define BOARD_ADC_PRESCAL          (7)
 #define BOARD_TSD_STARTUP          (40)        /* 40 nanoseconds */
-#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1µs at 8MHz */
+#define BOARD_TSD_TRACKTIM         (2000)      /* Min 1us at 8MHz */
 #define BOARD_TSD_DEBOUNCE         (10000000)  /* 10 milliseconds (units nanoseconds) */
 
 /* HSMCI clocking