diff --git a/pinouts/pin_functions.h b/pinouts/pin_functions.h
index 52ea0f3..223c93b 100644
--- a/pinouts/pin_functions.h
+++ b/pinouts/pin_functions.h
@@ -8,7 +8,11 @@
   #define output_pin(ddr, pin)        ddr |= _BV(pin)
   #define pullup_pin(ddr, port, pin)  ddr &= ~_BV(pin); port |= _BV(pin)
 #elif defined(TEENSYDUINO)
+  #if F_CPU > 48000000
+  #define pulse_pin(port, pin)        digitalWriteFast(pin, HIGH); asm("nop"); digitalWriteFast(pin, LOW)
+  #else
   #define pulse_pin(port, pin)        digitalWriteFast(pin, HIGH); digitalWriteFast(pin, LOW)
+  #endif
   #define set_pin(port, pin)          digitalWriteFast(pin, HIGH)
   #define clear_pin(port, pin)        digitalWriteFast(pin, LOW)
   #define output_pin(ddr, pin)        pinMode(pin, OUTPUT)