diff --git a/main.c b/main.c
index cb2ec01..ee03b59 100644
--- a/main.c
+++ b/main.c
@@ -4,4 +4,6 @@
 // SysTick memory-mapped registers
 #define STCTRL *((volatile uint32_t *) 0xE000E010)          // CONTROL AND STATUS
 #define STRELOAD *((volatile uint32_t *) 0xE000E014)        // RELOAD VALUE
-#define STCURRENT *((volatile uint32_t *) 0xE000E018)       // CURRENT VALUE
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+#define STCURRENT *((volatile uint32_t *) 0xE000E018)       // CURRENT VALUE
+#define CLOCK_HZ 16000000       // CLOCK FREQUENCY OF EK-TM4C123GXL
+#define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1)  // SYSTICK RELOAD VALUE
\ No newline at end of file