diff --git a/main.c b/main.c
index 3b000fc..cb2ec01 100644
--- a/main.c
+++ b/main.c
@@ -1,3 +1,7 @@
 #include <stdint.h>
 #include <stdbool.h>
-#include "tm4c123gh6pm.h"
\ No newline at end of file
+#include "tm4c123gh6pm.h"
+// 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
\ No newline at end of file