In order to connect the displays in cascading mode, the data output pin (Dout) of one is connected to data input pin (Din) of the other display. All the displays are connected to the same CS pin.
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with non-volatile user-programmable upper and lower trigger points.
Now in order to display any character (For eg ‘A’), Think of the Registers from 0x01 to 0x08 as the addresses of the 8 ROWs and we need to turn the respective LEDs ON in each ROW.
This setup will provide a frequency of (45000000/255*692) = 255 Hz and we can vary the duty cycle to observe the changes in the sound of the buzzer.