8-bit serial interface by the MAX7219 LED Display Driver IC with the 68HC05 microcontroller interface circuit diagram composed of initialization after power shutdown mode entering 7219, at least until after 250 s belly out. Therefore, they must be initialized before the necessary work. Including exit shutdown mode, specify the manner and by decoding the digital decoder, set the brightness and scanning limits and so on. Taking into account the program may run in the hot start, so begin the initialization process can also be asked to enter shutdown mode, that is, do the following: * Write O000H, turn-off delay of at least 250µs · 7219 * write 0001H, exit off write the 091FH, 0 to 4 for the digital decoding written 0AOFH, the brightest state is set to write 0805H, scan limit set to digital 0 to 5 show write 0F01H, into test mode, all sections Display Delay 5s · write 0F00H, exit test, the normal way into the display driver