Index: power.h
===================================================================
--- power.h	(révision 2122)
+++ power.h	(copie de travail)
@@ -1505,7 +1505,51 @@
 
 #define clock_prescale_get()  (clock_div_t)(CLKPR & (uint8_t)((1<<CLKPS0)|(1<<CLKPS1)|(1<<CLKPS2)|(1<<CLKPS3)))
 
+#elif defined(XDIV)
 
+//Enum is declared for code compatibility
+typedef enum
+{
+    clock_div_1 = 1,
+    clock_div_2 = 2,
+    clock_div_4 = 4,
+    clock_div_8 = 8,
+    clock_div_16 = 16,
+    clock_div_32 = 32,
+    clock_div_64 = 64,
+    clock_div_128 = 128
+} clock_div_t;
+
+//X has to be between 1 and 129
+void clock_prescale_set(uint8 x)
+{
+    if(x == 0)
+    {
+        return;
+    }
+    else if(x == 1)//Disable prescaler
+    {
+        XDIV = 0;
+    }
+    else if(x <= 129)
+    {
+        XDIV = (129 - x) | _BV(XDIVEN);
+    }
+}
+
+uint8_t clock_prescale_get(void)
+{
+    if(bit_is_clear(XDIV, XDIVEN))
+    {
+        return 1;
+    }
+    else
+    {
+        return (129 - (XDIV & 0x7F));
+    }
+}
+
+
 #endif
 
 
Index: power.h
===================================================================
--- power.h	(révision 2122)
+++ power.h	(copie de travail)
@@ -1505,7 +1505,56 @@
 
 #define clock_prescale_get()  (clock_div_t)(CLKPR & (uint8_t)((1<<CLKPS0)|(1<<CLKPS1)|(1<<CLKPS2)|(1<<CLKPS3)))
 
+#elif defined(XDIV)
 
+//Enum is declared for code compatibility
+//could also be 
+//#define clock_div_1 1
+//...
+//#define clock_div_128 128
+//but then clock_div_t would not be recognized anymore
+typedef enum
+{
+    clock_div_1 = 1,
+    clock_div_2 = 2,
+    clock_div_4 = 4,
+    clock_div_8 = 8,
+    clock_div_16 = 16,
+    clock_div_32 = 32,
+    clock_div_64 = 64,
+    clock_div_128 = 128
+} clock_div_t;
+
+//X has to be between 1 and 129
+void clock_prescale_set(uint8 x)
+{
+    if(x == 0)
+    {
+        return;
+    }
+    else if(x == 1)//Disable prescaler
+    {
+        XDIV = 0;
+    }
+    else if(x <= 129)
+    {
+        XDIV &= ~_BV(XDIVEN);//XDIVEN needs to be 0 to change the XDIV value
+        XDIV = (129 - x) | _BV(XDIVEN);
+    }
+}
+
+uint8_t clock_prescale_get(void)
+{
+    if(bit_is_clear(XDIV, XDIVEN))
+    {
+        return 1;
+    }
+    else
+    {
+        return (129 - (XDIV & 0x7F));
+    }
+}
+
 #endif