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-rw-r--r--cores/arduino/wiring_private.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/wiring_private.h b/cores/arduino/wiring_private.h
index f678265..90dbf2c 100644
--- a/cores/arduino/wiring_private.h
+++ b/cores/arduino/wiring_private.h
@@ -54,7 +54,7 @@ extern "C"{
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define EXTERNAL_NUM_INTERRUPTS 8
-#elif defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644P__)
+#elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__)
#define EXTERNAL_NUM_INTERRUPTS 3
#elif defined(__AVR_ATmega32U4__)
#define EXTERNAL_NUM_INTERRUPTS 4