diff --git a/Makefile b/Makefile
index 4fe4e70..ba8d1c5 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,9 @@ else
     endif
 endif
 
+# set uart baudrate
+BAUD := 9600
+
 # set CC TOOL
 PACKIHX := packihx
 CFLAGS := -DUSE_FLOATS=1
@@ -51,9 +54,11 @@ main.hex: $(TARGET)
 
 flash:
 	-sudo chmod 777 $(COM)
-	-./reset_mcu.sh $(COM)
+	-./reset_mcu.sh $(COM) $(BAUD)
 	-stcgal -P stc89 -p $(COM) main.hex
 
+com:
+	-minicom -D $(COM) -b $(BAUD)
 #led.bin:led.hex
 #       objcopy -I ihex -O binary led.hex led.bin
 
diff --git a/reset_mcu.sh b/reset_mcu.sh
index 8c9580a..05b8a4d 100755
--- a/reset_mcu.sh
+++ b/reset_mcu.sh
@@ -16,11 +16,11 @@
 # ---      ----        ---         -----------
 # 0.0.01   2024-07-14  Feng Bohan  initial version
 #===========================================================================
-if [ "$#" -ne 1 ]; then
-    echo "错误：此脚本需要且仅需要一个参数, 作为COM口号"
+if [ "$#" -ne 2 ]; then
+    echo "错误：此脚本需要且仅需要2个参数, 作为COM口号和波特率。"
     exit 1  # 使用非零状态码退出表示异常
 fi
-stty -F $1 speed 9600 cs8 -parenb -cstopb raw -echo -echoe -echok -echoctl -echoke
+stty -F $1 speed $2 cs8 -parenb -cstopb raw -echo -echoe -echok -echoctl -echoke
 
 echo -e "RESET!" > $1