diff --git a/wasp/boards/simulator/watch.py b/wasp/boards/simulator/watch.py
index e5cf2b2..f6e3d9f 100644
--- a/wasp/boards/simulator/watch.py
+++ b/wasp/boards/simulator/watch.py
@@ -155,6 +155,12 @@ class HRS():
         self._i = 0
         self._step = 1
 
+    def read_reg(self, addr):
+        pass
+
+    def write_reg(self, addr, val):
+        pass
+
     def enable(self):
         pass