13, using AT89S51 microcontroller shown P0 port P0.0 - P0.7 code to connect to a common cathode tube a - h on the pen segment, the digital public grounded. Circulation in the digital display 0--9 digital time interval 0.2 seconds.
The "SCM system" area of P0.0 / AD0 - P0.7 / AD7 port with 8-core cable connected to the "four static digital display module" any area of a digital control of a - h port on; requirements : P0.0 / AD0 and a connected, P0.1 / AD1 and b are connected, P0.2 / AD2 and c are connected, ......, P0.7 / AD7 connected with h.
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