diff --git a/portable/GCC/RX100/portmacro.h b/portable/GCC/RX100/portmacro.h
index b32d200..01bc362 100644
--- a/portable/GCC/RX100/portmacro.h
+++ b/portable/GCC/RX100/portmacro.h
@@ -147,6 +147,8 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
 
+#define portMEMORY_BARRIER()                                  __asm volatile ( "" ::: "memory" )
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/GCC/RX200/portmacro.h b/portable/GCC/RX200/portmacro.h
index 2f153f8..aee4e4d 100644
--- a/portable/GCC/RX200/portmacro.h
+++ b/portable/GCC/RX200/portmacro.h
@@ -141,6 +141,8 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
 
+#define portMEMORY_BARRIER()                                  __asm volatile ( "" ::: "memory" )
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/GCC/RX600/portmacro.h b/portable/GCC/RX600/portmacro.h
index 7d1fdb6..d441eb7 100644
--- a/portable/GCC/RX600/portmacro.h
+++ b/portable/GCC/RX600/portmacro.h
@@ -141,6 +141,8 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
 
+#define portMEMORY_BARRIER()                                  __asm volatile ( "" ::: "memory" )
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/GCC/RX600v2/portmacro.h b/portable/GCC/RX600v2/portmacro.h
index 7d1fdb6..d441eb7 100644
--- a/portable/GCC/RX600v2/portmacro.h
+++ b/portable/GCC/RX600v2/portmacro.h
@@ -141,6 +141,8 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
 
+#define portMEMORY_BARRIER()                                  __asm volatile ( "" ::: "memory" )
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/GCC/RX700v3_DPFPU/portmacro.h b/portable/GCC/RX700v3_DPFPU/portmacro.h
index 8e67724..4f9b8a0 100644
--- a/portable/GCC/RX700v3_DPFPU/portmacro.h
+++ b/portable/GCC/RX700v3_DPFPU/portmacro.h
@@ -185,6 +185,8 @@
 /* Definition to allow compatibility with existing FreeRTOS Demo using flop.c. */
 #define portTASK_USES_FLOATING_POINT()    vPortTaskUsesDPFPU()
 
+#define portMEMORY_BARRIER()              __asm volatile ( "" ::: "memory" )
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/Renesas/RX100/portmacro.h b/portable/Renesas/RX100/portmacro.h
index b82fdca..a954bb7 100644
--- a/portable/Renesas/RX100/portmacro.h
+++ b/portable/Renesas/RX100/portmacro.h
@@ -148,6 +148,13 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
 
+#pragma inline_asm vPortMemoryBarrier
+static void vPortMemoryBarrier( void )
+{
+}
+
+#define portMEMORY_BARRIER()    vPortMemoryBarrier()
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/Renesas/RX200/portmacro.h b/portable/Renesas/RX200/portmacro.h
index 55278da..efb9d93 100644
--- a/portable/Renesas/RX200/portmacro.h
+++ b/portable/Renesas/RX200/portmacro.h
@@ -138,6 +138,12 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
 
+#pragma inline_asm vPortMemoryBarrier
+static void vPortMemoryBarrier( void )
+{
+}
+
+#define portMEMORY_BARRIER()    vPortMemoryBarrier()
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/Renesas/RX600/portmacro.h b/portable/Renesas/RX600/portmacro.h
index 60106ae..5ba1c06 100644
--- a/portable/Renesas/RX600/portmacro.h
+++ b/portable/Renesas/RX600/portmacro.h
@@ -139,6 +139,13 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
 
+#pragma inline_asm vPortMemoryBarrier
+static void vPortMemoryBarrier( void )
+{
+}
+
+#define portMEMORY_BARRIER()    vPortMemoryBarrier()
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/Renesas/RX600v2/portmacro.h b/portable/Renesas/RX600v2/portmacro.h
index 6efba64..630a34ee 100644
--- a/portable/Renesas/RX600v2/portmacro.h
+++ b/portable/Renesas/RX600v2/portmacro.h
@@ -139,6 +139,13 @@
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
 
+#pragma inline_asm vPortMemoryBarrier
+static void vPortMemoryBarrier( void )
+{
+}
+
+#define portMEMORY_BARRIER()    vPortMemoryBarrier()
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }
diff --git a/portable/Renesas/RX700v3_DPFPU/portmacro.h b/portable/Renesas/RX700v3_DPFPU/portmacro.h
index fef1355..891024a 100644
--- a/portable/Renesas/RX700v3_DPFPU/portmacro.h
+++ b/portable/Renesas/RX700v3_DPFPU/portmacro.h
@@ -183,6 +183,13 @@
 /* Definition to allow compatibility with existing FreeRTOS Demo using flop.c. */
     #define portTASK_USES_FLOATING_POINT() vPortTaskUsesDPFPU()
 
+#pragma inline_asm vPortMemoryBarrier
+static void vPortMemoryBarrier( void )
+{
+}
+
+#define portMEMORY_BARRIER()    vPortMemoryBarrier()
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
     }