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LCD Power on sequence — Parallax Forums

LCD Power on sequence

LarryCardoLarryCardo Posts: 28
edited 2012-12-19 18:52 in Accessories
The LCD manual says "Rev E CAUTION
DO NOT PROVIDE A SIGNAL TO THE 'RX' PIN BEFORE APPLYING 5 VDC TO THE '5V' PIN".

How do you practically do this? A relay that delays power to the microprocessor? Or the first microprocessor instruction to make the pin low?

Thanks

Comments

  • lardomlardom Posts: 1,659
    edited 2012-12-19 18:13
    It just means supply power to the device before you send data. The LCD has to initialize first.
  • LarryCardoLarryCardo Posts: 28
    edited 2012-12-19 18:34
    I have one switch that applies power to the Microprocessor (PIC) and the Parallax LCD. If I just pause the microprocessor before sending data to the LCD, would that be OK? Or should I also hold the Rx pin low during this pause?

    Thanks lardom
  • lardomlardom Posts: 1,659
    edited 2012-12-19 18:52
    This is the wrong forum for PIC micros BTW but the delay only applies to the LCD. Your microcontroller is free to work on another task. Once the LCD has powered up and has initialized you can send it data.
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