diff --git a/source/msp/UART4.C b/source/msp/UART4.C
index 7df2059..9b4c134 100644
--- a/source/msp/UART4.C
+++ b/source/msp/UART4.C
@@ -23,13 +23,13 @@ void L0_uart4_init(void)//115200bps@11.0592MHz
 #endif
 	
 	
-#elif (MainFre_22M == D_sys_MainFre)	//115200bps@22.1184MHz
+#elif (MainFre_22M == D_sys_MainFre)	//9600bps@22.1184MHz
 	S4CON = 0x10;		//8位数据,可变波特率
 	S4CON |= 0x40;		//串口4选择定时器4为波特率发生器
-	T4T3M |= 0x20;		//定时器4时钟为Fosc,即1T
-	T4L = 0xD0;		//设定定时初值
-	T4H = 0xFF;		//设定定时初值
-	T4T3M |= 0x80;		//启动定时器4
+	T4T3M |= 0x20;		//定时器时钟1T模式
+	T4L = 0xC0;			//设置定时初始值
+	T4H = 0xFD;			//设置定时初始值
+	T4T3M |= 0x80;		//定时器4开始计时
 #endif
 }