diff --git a/arch/arm/src/sam34/sam3x_periphclks.h b/arch/arm/src/sam34/sam3x_periphclks.h
index a6b106cc88..f20a86a0e8 100644
--- a/arch/arm/src/sam34/sam3x_periphclks.h
+++ b/arch/arm/src/sam34/sam3x_periphclks.h
@@ -52,8 +52,8 @@
 
 #define sam_enableperiph0(s)       putreg32((1 << (s)), SAM_PMC_PCER0)
 #define sam_enableperiph1(s)       putreg32((1 << ((s) - 32)), SAM_PMC_PCER1)
-#define sam_disableperiph0(s)      putreg32((1 << (s)), SAM_PMC_PDER0)
-#define sam_disableperiph1(s)      putreg32((1 << ((s) - 32)), SAM_PMC_PDER1)
+#define sam_disableperiph0(s)      putreg32((1 << (s)), SAM_PMC_PCDR0)
+#define sam_disableperiph1(s)      putreg32((1 << ((s) - 32)), SAM_PMC_PCDR1)
 
 #define sam_supc_enableclk()       sam_enableperiph0(SAM_PID_SUPC)
 #define sam_rstc_enableclk()       sam_enableperiph0(SAM_PID_RSTC)
diff --git a/arch/arm/src/sam34/sam_rtt.c b/arch/arm/src/sam34/sam_rtt.c
index fc9ddd1706..e417a65650 100644
--- a/arch/arm/src/sam34/sam_rtt.c
+++ b/arch/arm/src/sam34/sam_rtt.c
@@ -67,7 +67,7 @@
 #  define RTT_PRES      1
 #endif
 
-#define RTT_FCLK        (BOARD_SLCK_FREQUENCY/RTT_PRES)
+#define RTT_FCLK        (BOARD_SCLK_FREQUENCY/RTT_PRES)
 #define RTT_MAXTIMEOUT  ((1000000ULL * (0x100000000ULL)) / RTT_FCLK)
 
 /* Configuration ************************************************************/
diff --git a/arch/arm/src/sam34/sam_tc.c b/arch/arm/src/sam34/sam_tc.c
index b955d6bb03..1f866726a6 100644
--- a/arch/arm/src/sam34/sam_tc.c
+++ b/arch/arm/src/sam34/sam_tc.c
@@ -66,7 +66,7 @@
 
 /* TODO: Allow selection of any of the input clocks */
 
-#define TC_FCLK        (BOARD_SLCK_FREQUENCY)
+#define TC_FCLK        (BOARD_SCLK_FREQUENCY)
 #define TC_MAXTIMEOUT  ((1000000ULL * (1ULL + TC_RVALUE_MASK)) / TC_FCLK)
 
 /* Configuration ************************************************************/
diff --git a/arch/arm/src/sam34/sam_wdt.c b/arch/arm/src/sam34/sam_wdt.c
index 7886b78429..40d59d10a8 100644
--- a/arch/arm/src/sam34/sam_wdt.c
+++ b/arch/arm/src/sam34/sam_wdt.c
@@ -71,7 +71,7 @@
  *   1000 * 64 / Fmin = 49.93 msec
  */
 
-#define WDT_FCLK        (BOARD_SLCK_FREQUENCY / 128)
+#define WDT_FCLK        (BOARD_SCLK_FREQUENCY / 128)
 #define WDT_MAXTIMEOUT  ((1000 * (WDT_MR_WDV_MAX+1)) / WDT_FCLK)
 
 /* Configuration ************************************************************/
diff --git a/arch/arm/src/sama5/sam_wdt.c b/arch/arm/src/sama5/sam_wdt.c
index 8d8d10dcd8..706f8e8a39 100644
--- a/arch/arm/src/sama5/sam_wdt.c
+++ b/arch/arm/src/sama5/sam_wdt.c
@@ -61,11 +61,11 @@
  * 32768 kHz).
  */
 
-#ifndef BOARD_SLCK_FREQUENCY
-#  define BOARD_SLCK_FREQUENCY 32768
+#ifndef BOARD_SCLK_FREQUENCY
+#  define BOARD_SCLK_FREQUENCY 32768
 #endif
 
-#define WDT_FREQUENCY (BOARD_SLCK_FREQUENCY / 128)
+#define WDT_FREQUENCY (BOARD_SCLK_FREQUENCY / 128)
 
 /* At 32768Hz, the maximum timeout value will be:
  *
diff --git a/configs/arduino-due/include/board.h b/configs/arduino-due/include/board.h
index e47158116a..c537c783c5 100644
--- a/configs/arduino-due/include/board.h
+++ b/configs/arduino-due/include/board.h
@@ -64,6 +64,10 @@
  *   CPU clock: 84MHz
  */
 
+#define BOARD_32KOSC_FREQUENCY     (32768)
+#define BOARD_SCLK_FREQUENCY       (BOARD_32KOSC_FREQUENCY)
+#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
+
 /* Main oscillator register settings.
  *
  *   The start up time should be should be:
@@ -97,7 +101,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (168000000) /* PLLACK:  14 * 12Mhz / 1 */
 #define BOARD_MCK_FREQUENCY        (84000000)  /* MCK:     PLLACK / 2 */
 #define BOARD_CPU_FREQUENCY        (84000000)  /* CPU:     MCK */
diff --git a/configs/sam4s-xplained-pro/include/board.h b/configs/sam4s-xplained-pro/include/board.h
index 13ebfd37d1..2158bfb348 100644
--- a/configs/sam4s-xplained-pro/include/board.h
+++ b/configs/sam4s-xplained-pro/include/board.h
@@ -65,7 +65,7 @@
 #define BOARD_CKGR_MOR_MOSCXTST     (63 << PMC_CKGR_MOR_MOSCXTST_SHIFT) /* Start-up Time */
 
 #define BOARD_32KOSC_FREQUENCY      (32768)
-#define BOARD_SLCK_FREQUENCY        (BOARD_32KOSC_FREQUENCY)
+#define BOARD_SCLK_FREQUENCY        (BOARD_32KOSC_FREQUENCY)
 #define BOARD_MAINOSC_FREQUENCY     (12000000)
 
 #ifdef CONFIG_SAM34_UDP