LCD connections using 4 data lines

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    Question: In PSoC1 or PSoC3 can we use only 4 data lines to drive the LCD. Also, should these pins be connected consequently.

    Answer: In PSoC Designer and Creator, the LCD APIs uses only 7 bits, the description is as below:-

    4 for data lines (D4-D7)

    1 for Enable.

    1 for Register Select (RS)

    1 for Read/Write (RW)

    D0-D3 lines of LCD should be grounded.

    These pins must be connected consequently on a single port.

    i.e. on a single port,  first 4 pins should be data lines, 5th pin as Enable, 6th as Register Select and 7th as Read/Write