MAX7219 dot matrix module Red

1 an 8 * 8 dot matrix module 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 3mm
Five modules with input and output interfaces, support for cascading multiple modules
Wiring instructions:
1 on the left block to an input port, the one output port on the right.
2 the When controlling a module, simply enter the port to receive a CPU
The When wining 3 modules cascade output input termination CPU, the input output termination module of the first two modules of the first, the first two modules of the termination input of the three modules, and so on.
The Om 51 single example:
VCC 5 v
GND GND
DIN P2.2
CS P2.1
CLK P2.0