MAX7219-4xBM - dot matrix module 4 in one display

Description:
A single module can drive 4 pcs.8x8 dot matrix displays with common cathode
Operating voltage: 5V
Dimensions: length 12.8 cm X 12.8 cm wide and 1.3 cm high X
To fix the module with its displays there are 4 holes 3mm Ø
Module with input and output interfaces, support for cascading multiple modules

Wiring:
The input port will be connected to the CPU-module and the output port to the next display module.

VCC → 5V
GND → GND
DIN → P2.2
CS → P2.1
CLK → P2.0