diff --git a/examples/PCF8563_ClockOutput/PCF8563_ClockOutput.ino b/examples/PCF8563_ClockOutput/PCF8563_ClockOutput.ino
new file mode 100644
index 0000000..7316d51
--- /dev/null
+++ b/examples/PCF8563_ClockOutput/PCF8563_ClockOutput.ino
@@ -0,0 +1,95 @@
+/**
+ *
+ * @license MIT License
+ *
+ * Copyright (c) 2024 lewis he
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * @file      PCF8563_ClockOutput.ino
+ * @author    Lewis He (lewishe@outlook.com)
+ * @date      2024-10-16
+ *
+ */
+#include <Wire.h>
+#include <SPI.h>
+#include <Arduino.h>
+#include "SensorPCF8563.hpp"
+
+#ifndef SENSOR_SDA
+#define SENSOR_SDA  17
+#endif
+
+#ifndef SENSOR_SCL
+#define SENSOR_SCL  18
+#endif
+
+#ifndef SENSOR_IRQ
+#define SENSOR_IRQ  7
+#endif
+
+
+SensorPCF8563::ClockHz clock_array[] = {
+    SensorPCF8563::CLK_32_768KHZ,
+    SensorPCF8563::CLK_1024KHZ,
+    SensorPCF8563::CLK_32HZ,
+    SensorPCF8563::CLK_1HZ,
+    SensorPCF8563::CLK_DISABLE,
+};
+
+String freq_hz_str[] = {
+    "32.768KHZ",
+    "1.024KHZ",
+    "32HZ",
+    "1HZ",
+    "DISABLE",
+};
+
+
+SensorPCF8563 rtc;
+uint32_t lastMillis;
+uint8_t i = 0;
+
+
+void setup()
+{
+    Serial.begin(115200);
+    while (!Serial);
+    if (!rtc.begin(Wire, PCF8563_SLAVE_ADDRESS, SENSOR_SDA, SENSOR_SCL)) {
+        Serial.println("Failed to find PCF8563 - check your wiring!");
+        while (1) {
+            delay(1000);
+        }
+    }
+}
+
+
+void loop()
+{
+    if (millis() - lastMillis > 5000) {
+        lastMillis = millis();
+        Serial.print("Set freq : ");
+        Serial.println(freq_hz_str[i]);
+        rtc.setClockOutput(clock_array[i]);
+        i++;
+        i %= 5;
+    }
+}
+
+
diff --git a/platformio.ini b/platformio.ini
index 19693aa..30c0951 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -19,13 +19,14 @@
 ; src_dir = examples/PCF8563_TimeSynchronization
 ; src_dir = examples/PCF85063_SimpleTime
 ; src_dir = examples/PCF85063_AlarmByUnits
+src_dir = examples/PCF8563_ClockOutput
 ; src_dir = examples/PCF85063_ClockOutput
 ; src_dir = examples/QMC6310_CalibrateExample
 ; src_dir = examples/QMC6310_CompassExample
 ; src_dir = examples/QMC6310_GetDataExample
 ; src_dir = examples/QMC6310_GetPolarExample
 ; src_dir = examples/QMI8658_BlockExample
-src_dir = examples/QMI8658_CalibrationExample
+; src_dir = examples/QMI8658_CalibrationExample
 ; src_dir = examples/QMI8658_GetDataExample
 ; src_dir = examples/QMI8658_InterruptBlockExample
 ; src_dir = examples/QMI8658_InterruptExample
diff --git a/src/SensorPCF8563.hpp b/src/SensorPCF8563.hpp
index f48835e..a4c1a14 100644
--- a/src/SensorPCF8563.hpp
+++ b/src/SensorPCF8563.hpp
@@ -41,11 +41,12 @@ class SensorPCF8563 :
     friend class RTCCommon<SensorPCF8563>;
 public:
 
-    enum {
+    enum ClockHz {
         CLK_32_768KHZ,
         CLK_1024KHZ,
         CLK_32HZ,
         CLK_1HZ,
+        CLK_DISABLE,
     };
 
 
@@ -288,19 +289,15 @@ class SensorPCF8563 :
         writeRegister(PCF8563_TIMER1_REG, 0x00);
     }
 
-    void enableCLK(uint8_t freq)
+    void setClockOutput(ClockHz freq)
     {
-        if (freq > CLK_1HZ) return;
-        writeRegister(PCF8563_SQW_REG,  freq | PCF8563_CLK_ENABLE);
-    }
-
-    void disableCLK()
-    {
-        clrRegisterBit(PCF8563_SQW_REG, 7);
+        if (freq == CLK_DISABLE) {
+            clrRegisterBit(PCF8563_SQW_REG, 7);
+        } else {
+            writeRegister(PCF8563_SQW_REG,  freq | PCF8563_CLK_ENABLE);
+        }
     }
 
-
-
 private:
 
     bool initImpl()