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I am using 3.2' TFT LCD with touch pad. LCD has pins RD and WR. What is RD and WR pin?

Is WR for RD also ( for both write as well as read )?

Where to connect RD pin of LCD?

Please see attached pinout of LCD.enter image description here

asked Nov 29, 2014 at 6:26
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1 Answer 1

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The datasheet is the only real answer.

It looks like this LCD has a combination of interfaces:

  • DB0 .. DB15 with RD and WR seem to be a parallel interface (for the LCD??)
  • The D_* pins seem to be a serial (SPI-like) interface (for the touch-screen??)
  • the SD_* pins seem to be another serial (SPI-like) interface - is this one of thise LCDs with an on-board SD card connector?

A parallel interface with separate RW en WR pins (8080 style) requires that one of those pins is made active to do a read or write cycle. Often an alternative 'format' is provided where one pin selects between read and write, and another pin is activated to do a cycle (6800 style).

answered Nov 29, 2014 at 8:20
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