diff --git a/csl/stm32f042k6t6/implementation/imp_timer.c b/csl/stm32f042k6t6/implementation/imp_timer.c
index e182f8d..71eea97 100644
--- a/csl/stm32f042k6t6/implementation/imp_timer.c
+++ b/csl/stm32f042k6t6/implementation/imp_timer.c
@@ -3,6 +3,14 @@
 
 #define BASE ((TIM_TypeDef *)timerBase_Addr_List[timer])
 
+#define HANDLE_INT_FLAG(flagReg, flagMask, intType) \
+	do { \ // do{ ... }while(1) is used to insure that this makro acts as a function call
+        if ((flagReg) & (flagMask)) { \	// check if flag is set
+            (flagReg) &= ~(flagMask); \ // clear flag
+            ((intHandler_t)(intHandlerList[intType]))(); \ // eecute handler
+        } \
+    } while (0)
+
 void timerReset(timerNo_t timer)
 {
 	if(timerBus_No[timer]==1)