Consider the circuit, HC908QY4 is the heart of all. It uses a pin PTB0, PTB1 and PTB2 to control and display the text on the LCD. This leads to (shift regiter – serial to parallel converter) CD4094 that we will provide the data bus to LCD display.
In the CD4094 data are synchronized on the rising edge and the LCD display will take on the falling edge shows us that this signal can be shared.

