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we are having keil MCB2140 kit.we are trying to interface LCD to this kit which has LPC2148 as the microcontroller.The LCD'S supply votage is 5v.we have given it through an external supply. The boards supply voltage is 3.3 volts. We are not getting the result. The query we are having is if we send commands from the board to LCD in terms of high-low voltages through ports,does the LCD accept this high voltage of 3.3v.
It is obviously the datasheet for the LCD that can tell you if 3.3V is enough to be accepted as a logic high. Without information about the LCD, this forum can not even help with reading the datasheet.
The next thing is that not all pins on the LPC2148 are 5V-tolerant. And do you have any series resistors to limit the currents?
Thank you for your solution.We are not giving 5v to the pins of lpc 2148 and hence we have dropped the idea of current limiting resistors..