diff --git a/lib/usart b/lib/usart
index 05034f9..a20e3d9 160000
--- a/lib/usart
+++ b/lib/usart
@@ -1 +1 @@
-Subproject commit 05034f925671f06abe15097326b05eceeef0bc1e
+Subproject commit a20e3d98368bb98d9d481c3c72befcb72c666a83