Lcd 16x2 circuit and sample program...

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  1. - 20th July 2012, 11:03 #1
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    Default Lcd 16x2 circuit and sample program...

    Please help me..tq..
  2. - 20th July 2012, 11:04 #2
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    Default Re: Lcd 16x2 circuit and sample program...

    Im using pic16f877a 20mhz
  3. - 20th July 2012, 12:00 #3
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    Default Re: Lcd 16x2 circuit and sample program...

    Look in the PBP manual under LCDOUT......
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  4. - 20th July 2012, 13:43 #4
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    Default Re: Lcd 16x2 circuit and sample program...

    Its must put pullup resistor on rs terminal?
  5. - 20th July 2012, 20:05 #5
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    Default Re: Lcd 16x2 circuit and sample program...

    Only if you are using a pin that does not have an internal one.
  6. - 21st July 2012, 00:00 #6
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    Default Re: Lcd 16x2 circuit and sample program...

    I'm using portb (pic16f877a),its must add pull up resistor for rs?
  7. - 21st July 2012, 05:28 #7
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    Default Re: Lcd 16x2 circuit and sample program...

    Why not show your code and connections? Then someone may be able to help you.
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  8. - 21st July 2012, 19:39 #8
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    Default Re: Lcd 16x2 circuit and sample program...

    If you use the MCLR pin, then yes. The example in the book does. The MCLR pin of the PIC (generally) can not drive a load and therefor requires a pull up resistor to provide that function. Other pins CAN drive a load and do NOT require a pull up resistor.
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  9. - 22nd July 2012, 11:21 #9
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    Default Re: Lcd 16x2 circuit and sample program...

    Some devices have internal soft pullups on port B that must be enabled. I'm not sure yours is one or them - check the datasheet.
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