diff --git a/ADF7021.cpp b/ADF7021.cpp
index fa795f8..681144e 100644
--- a/ADF7021.cpp
+++ b/ADF7021.cpp
@@ -142,6 +142,12 @@ void CIO::ifConf()
   uint32_t ADF7021_REG4  = 0;
   uint32_t ADF7021_REG13 = 0;
 
+  // Toggle CE pin for ADF7021 reset
+  CE_pin(LOW);
+  delay_rx();
+  CE_pin(HIGH);
+  delay_rx();
+
   // Check frequency band
   if( (m_frequency_tx >= VHF1_MIN) && (m_frequency_tx < VHF1_MAX) ) {
     ADF7021_REG1 = ADF7021_REG1_VHF1;         // VHF1, external VCO
diff --git a/IO.cpp b/IO.cpp
index f26920e..7a3ff86 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -39,6 +39,7 @@ m_watchdog(0U)
 {
   Init();
 
+  CE_pin(HIGH);
   LED_pin(HIGH);
   PTT_pin(LOW);
   DSTAR_pin(LOW);
diff --git a/IO.h b/IO.h
index cd5b67f..49b3809 100644
--- a/IO.h
+++ b/IO.h
@@ -50,6 +50,7 @@ public:
   void     SDATA_pin(bool on);
   bool     SREAD_pin(void);
   void     SLE_pin(bool on);
+  void     CE_pin(bool on);
   bool     RXD_pin(void);
   
 #if defined(BIDIR_DATA_PIN)
diff --git a/IOArduino.cpp b/IOArduino.cpp
index e80673b..cc476d5 100644
--- a/IOArduino.cpp
+++ b/IOArduino.cpp
@@ -30,6 +30,7 @@
 #define PIN_SREAD      PB7
 #define PIN_SDATA      PB6
 #define PIN_SLE        PB8
+#define PIN_CE         PC14
 #define PIN_RXD        PB4
 #define PIN_TXD        PB3
 #define PIN_CLKOUT     PA15
@@ -49,6 +50,7 @@
 #define PIN_SDATA      4   // 2 in Arduino Zero Pro
 #define PIN_SREAD      5
 #define PIN_SLE        6
+#define PIN_CE        12
 #define PIN_RXD        7
 #define PIN_TXD        8
 #define PIN_CLKOUT     2   // 4 in Arduino Zero Pro
@@ -92,6 +94,7 @@ void CIO::Init()
   pinMode(PIN_SDATA, OUTPUT);
   pinMode(PIN_SREAD, INPUT);
   pinMode(PIN_SLE, OUTPUT);
+  pinMode(PIN_CE, OUTPUT);
   pinMode(PIN_RXD, INPUT);
   pinMode(PIN_CLKOUT, INPUT);
   pinMode(PIN_LED, OUTPUT);
@@ -164,6 +167,11 @@ void CIO::SLE_pin(bool on)
   digitalWrite(PIN_SLE, on ? HIGH : LOW);
 }
 
+void CIO::CE_pin(bool on) 
+{
+  digitalWrite(PIN_CE, on ? HIGH : LOW);
+}
+
 bool CIO::RXD_pin()
 {
   return digitalRead(PIN_RXD) == HIGH;
diff --git a/IOSTM.cpp b/IOSTM.cpp
index 7e8b403..c521974 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -36,6 +36,9 @@
 #define PIN_SLE              GPIO_Pin_8
 #define PORT_SLE             GPIOB
 
+#define PIN_CE               GPIO_Pin_14
+#define PORT_CE              GPIOC
+
 #define PIN_RXD              GPIO_Pin_4
 #define PORT_RXD             GPIOB
 
@@ -180,6 +183,12 @@ void CIO::Init()
   GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
   GPIO_Init(PORT_SLE, &GPIO_InitStruct);
 
+  // Pin CE
+  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStruct.GPIO_Pin   = PIN_CE;
+  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_Out_PP;
+  GPIO_Init(PORT_CE, &GPIO_InitStruct);
+
   // Pin RXD
   GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStruct.GPIO_Pin   = PIN_RXD;
@@ -327,6 +336,11 @@ void CIO::SLE_pin(bool on)
   GPIO_WriteBit(PORT_SLE, PIN_SLE, on ? Bit_SET : Bit_RESET);
 }
 
+void CIO::CE_pin(bool on)
+{
+  GPIO_WriteBit(PORT_CE, PIN_CE, on ? Bit_SET : Bit_RESET);
+}
+
 bool CIO::RXD_pin()
 {
   return GPIO_ReadInputDataBit(PORT_RXD, PIN_RXD) == Bit_SET;