Please help me..tq..
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Please help me..tq..
Im using pic16f877a 20mhz
Look in the PBP manual under LCDOUT......
Its must put pullup resistor on rs terminal?
Only if you are using a pin that does not have an internal one.
I'm using portb (pic16f877a),its must add pull up resistor for rs?
Why not show your code and connections? Then someone may be able to help you.
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.
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.