Avoir un "arduino as isp" qui permet d'avoir un signal "clock" sur la pin 9:
https://raw.github.com/adafruit/ArduinoISP/master/ArduinoISP.ino
Arduino ISP_8MHz pins and function
Arduino Pin Atmega328x Pin Function
13 19 SCK
12 18 MISO
11 17 MOSI
10 1 RESET
9 9 8MHz Clock
8 NA Error LED (Red)
7 NA Program LED (Yellow)
6 NA Heartbeat LED (Green)
5V 7 5V
GND 8 0