diff --git a/boards/default_src/micropython/generators/system.js b/boards/default_src/micropython/generators/system.js
index de7dd76b..6028fb20 100644
--- a/boards/default_src/micropython/generators/system.js
+++ b/boards/default_src/micropython/generators/system.js
@@ -139,7 +139,7 @@ export const timer = function (_, generator) {
 export const set_system_timer = function (_, generator) {
     generator.definitions_['import_machine'] = 'import machine';
     var v = generator.valueToCode(this, "VAR", generator.ORDER_NONE) || "None";
-    var i = generator.valueToCode(this, "ID", generator.ORDER_NONE) || "None";
+    var i = generator.valueToCode(this, "PIN", generator.ORDER_NONE) || "None";
     var period = generator.valueToCode(this, "period", generator.ORDER_NONE) || "0";
     var mode = this.getFieldValue('mode');
     var callback = generator.valueToCode(this, "callback", generator.ORDER_NONE) || "None";
diff --git a/boards/default_src/micropython_esp32/template.xml b/boards/default_src/micropython_esp32/template.xml
index 31e611b5..e003f4c9 100644
--- a/boards/default_src/micropython_esp32/template.xml
+++ b/boards/default_src/micropython_esp32/template.xml
@@ -254,7 +254,7 @@
       </value>
       <value name="callback">
         <shadow type="factory_block_return">
-          <field name="VALUE">tim_6</field>
+          <field name="VALUE">tim_callback</field>
         </shadow>
       </value>
     </block>
diff --git a/boards/default_src/micropython_esp32c2/template.xml b/boards/default_src/micropython_esp32c2/template.xml
index f5a0bb55..6a5dee4f 100644
--- a/boards/default_src/micropython_esp32c2/template.xml
+++ b/boards/default_src/micropython_esp32c2/template.xml
@@ -229,7 +229,7 @@
       </value>
       <value name="callback">
         <shadow type="factory_block_return">
-          <field name="VALUE">tim_6</field>
+          <field name="VALUE">tim_callback</field>
         </shadow>
       </value>
     </block>
diff --git a/boards/default_src/micropython_esp32c3/template.xml b/boards/default_src/micropython_esp32c3/template.xml
index 3ac0cf2d..31ea26fc 100644
--- a/boards/default_src/micropython_esp32c3/template.xml
+++ b/boards/default_src/micropython_esp32c3/template.xml
@@ -229,7 +229,7 @@
       </value>
       <value name="callback">
         <shadow type="factory_block_return">
-          <field name="VALUE">tim_6</field>
+          <field name="VALUE">tim_callback</field>
         </shadow>
       </value>
     </block>
diff --git a/boards/default_src/micropython_esp32s2/template.xml b/boards/default_src/micropython_esp32s2/template.xml
index 94ccb6c7..89348d79 100644
--- a/boards/default_src/micropython_esp32s2/template.xml
+++ b/boards/default_src/micropython_esp32s2/template.xml
@@ -254,7 +254,7 @@
       </value>
       <value name="callback">
         <shadow type="factory_block_return">
-          <field name="VALUE">tim_6</field>
+          <field name="VALUE">tim_callback</field>
         </shadow>
       </value>
     </block>
diff --git a/boards/default_src/micropython_esp32s3/template.xml b/boards/default_src/micropython_esp32s3/template.xml
index 46ec212d..83575a96 100644
--- a/boards/default_src/micropython_esp32s3/template.xml
+++ b/boards/default_src/micropython_esp32s3/template.xml
@@ -254,7 +254,7 @@
       </value>
       <value name="callback">
         <shadow type="factory_block_return">
-          <field name="VALUE">tim_6</field>
+          <field name="VALUE">tim_callback</field>
         </shadow>
       </value>
     </block>