Digital Electronics: Principles, Devices and Applications

Microcontrollers 599V CCI/O PinMicrocontrollerI/O PinI/O PinI/O PinI/O PinI/O PinI/O Pin1K1K1K1K1K1K1K12345678abcdefgdpafgedCOM9bcdp12345678abcdefgdpafgedCOM9bcdpGNDV CC+V CCI/OPinI/OPinMicrocontrollerFigure 14.33Multiplexed circuit for two CA displays for direct connection.the LCD module. When the RW line is LOW, the instruction on the data bus is written on the LCD.When the RW line is HIGH, the data are being read from the LCD.The software routine initializes the LCD firstly by setting the width of the data bus, selecting thecharacter, font, etc., clearing the LCD, turning on the LCD module and the cursor, setting the cursorposition and so on. Then the data to be displayed are sent on the data lines, and the three controlsignals are made use of to ensure proper LCD operation.