diff --git a/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h b/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
index d787456d6b..ddea5c6061 100644
--- a/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
+++ b/Marlin/src/HAL/HAL_AVR/endstop_interrupts.h
@@ -51,20 +51,53 @@ void endstop_ISR() { endstops.update(); }
  * There are more PCI-enabled processor pins on Port J, but they are not connected to Arduino MEGA.
  */
 #if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
+
   #define digitalPinHasPCICR(p)   (WITHIN(p, 10, 15) || WITHIN(p, 50, 53) || WITHIN(p, 62, 69))
-  #define moreDigitalPinToPCICR(p)    digitalPinToPCICR(WITHIN(p, 14, 15) ? 10 : p)
-  #define moreDigitalPinToPCICRbit(p) (WITHIN(p, 14, 15) ? 1 : digitalPinToPCICRbit(p))
-  #define moreDigitalPinToPCMSK(p)    (WITHIN(p, 14, 15) ? (&PCMSK1) : digitalPinToPCMSK(p))
-  #define moreDigitalPinToPCMSKbit(p) digitalPinToPCMSKbit(WITHIN(p, 14, 15) ? (p)+36 : p)
+
+  #undef  digitalPinToPCICR
+  #define digitalPinToPCICR(p)    (digitalPinHasPCICR(p) ? (&PCICR) : nullptr)
+
+  #undef  digitalPinToPCICRbit
+  #define digitalPinToPCICRbit(p) (WITHIN(p, 10, 13) || WITHIN(p, 50, 53) ? 0 : \
+                                   WITHIN(p, 14, 15) ? 1 : \
+                                   WITHIN(p, 62, 69) ? 2 : \
+                                   0)
+  
+  #undef  digitalPinToPCMSK
+  #define digitalPinToPCMSK(p)    (WITHIN(p, 10, 13) || WITHIN(p, 50, 53) ? (&PCMSK0) : \
+                                   WITHIN(p, 14, 15) ? (&PCMSK1) : \
+                                   WITHIN(p, 62, 69) ? (&PCMSK2) : \
+                                   nullptr)
+
+  #undef  digitalPinToPCMSKbit
+  #define digitalPinToPCMSKbit(p) (WITHIN(p, 10, 13) ? ((p) - 6) : \
+                                   (p) == 14 || (p) == 51 ? 2 : \
+                                   (p) == 15 || (p) == 52 ? 1 : \
+                                   (p) == 50 ? 3 : \
+                                   (p) == 53 ? 0 : \
+                                   WITHIN(p, 62, 69) ? ((p) - 62) : \
+                                   0)
+
+#elif defined(__AVR_ATmega164A__) || defined(__AVR_ATmega164P__) || defined(__AVR_ATmega324A__) || \
+      defined(__AVR_ATmega324P__) || defined(__AVR_ATmega324PA__) || defined(__AVR_ATmega324PB__) || \
+      defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284__) || \
+      defined(__AVR_ATmega1284P__)
+
+  #define digitalPinHasPCICR(p)   WITHIN(p, 0, NUM_DIGITAL_PINS)
+
+#else
+
+  #error "Unsupported AVR variant!"
+
 #endif
 
 
 // Install Pin change interrupt for a pin. Can be called multiple times.
 void pciSetup(const int8_t pin) {
-  if (moreDigitalPinToPCMSK(pin) != nullptr) {
-    SBI(*moreDigitalPinToPCMSK(pin), moreDigitalPinToPCMSKbit(pin));  // enable pin
-    SBI(PCIFR, moreDigitalPinToPCICRbit(pin)); // clear any outstanding interrupt
-    SBI(PCICR, moreDigitalPinToPCICRbit(pin)); // enable interrupt for the group
+  if (digitalPinToPCMSK(pin) != nullptr) {
+    SBI(*digitalPinToPCMSK(pin), digitalPinToPCMSKbit(pin));  // enable pin
+    SBI(PCIFR, digitalPinToPCICRbit(pin)); // clear any outstanding interrupt
+    SBI(PCICR, digitalPinToPCICRbit(pin)); // enable interrupt for the group
   }
 }
 
diff --git a/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
index 92c69cc90e..6dcfb67c54 100644
--- a/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
+++ b/buildroot/share/pin_interrupt_test/pin_interrupt_test.ino
@@ -2,16 +2,17 @@
 // Compile with the same build settings you'd use for Marlin.
 
 #if defined(ARDUINO_AVR_MEGA2560) || defined(ARDUINO_AVR_MEGA)
-  #define moreDigitalPinToPCICR(p) digitalPinToPCICR(WITHIN(p, 14, 15) ? 10 : p)
-#else
-  #define moreDigitalPinToPCICR(p) digitalPinToPCICR(p)
+    #undef  digitalPinToPCICR
+    #define digitalPinToPCICR(p)    ( ((p) >= 10 && (p) <= 15) || \
+                                      ((p) >= 50 && (p) <= 53) || \
+                                      ((p) >= 62 && (p) <= 69) ? (&PCICR) : nullptr)
 #endif
 
 void setup() {
   Serial.begin(9600);
   Serial.println("PINs causing interrupts are:");
   for (int i = 2; i < NUM_DIGITAL_PINS; i++) {
-    if (moreDigitalPinToPCICR(i) || (int)digitalPinToInterrupt(i) != -1) {
+    if (digitalPinToPCICR(i) || (int)digitalPinToInterrupt(i) != -1) {
       for (int j = 0; j < NUM_ANALOG_INPUTS; j++) {
         if (analogInputToDigitalPin(j) == i) {
           Serial.print('A');