MAX7219 dot matrix module

1 single module can drive the an 8 * 8 dot matrix common cathode
2 the module Operating voltage: 5 v
The Module 3 dimensions: length 3.2 cm X 3.2 cm wide X 1.3 cm high
4 holes with four screws, the diameter of 3 mm
Five modules with input and output interfaces, support for cascading multiple modules
Wiring instructions:
1 on the left block to an input port, the an output port on the right.
2 the When the control of a single module, simple enter the port received a CPU
The When wining 3 modules cascaded output input termination CPU, the input output termination module of the first two modules of the first one, the first two modules of the termination input terminal of the three modules, and so.
The To 51 single example:
VCC 5 v
GND GND
DIN P2.2
CS P2.1
CLK P2.0