Dear Memebers,

I have been breaking my head for past two days with a 20X4 Oriole make HD44780 compatible lcd. First let me describe the hardware and things I have done.
1. LCD is being interfaced in 4 bit mode.
2. LCD R/W is hard tied to ground since I never read LCD.
3. The 6 signals i.e. RS, EN, D4, D5, D6, D7 are fed to LCD from a buffer 74HC541. The inputs of buffer 74HC541 are fed through micro P89V51RD2. The buffer has all 8 inputs and enable pulse connected to the micro pins but two outputs are floating since I needed only 6 signals for LCD.
4. The D0-D3 pins of LCD too are connected no where they too float.
5. I have checked the timings for various operations and pulses with the product datasheet and my program is using atleast 10 times larger timings.
6. There seems to be no problem with software it is written in Keil C and if needed I will post it here.

The problem is...
This problem is not always but frequent and occurance is very random.

1. LCD sometimes displays some junk characters which were not sent to it for display. I can't reproduce the junk characters that it displays here since I don't have font for them. I have checked the charcter pattern given in the datasheet and came to know that these characters are 11110010, 11110011, 11110100, 11110101, 11110110, 11110111 binary.
2. I issue LCD clear command i.e. 0x01 before displaying a new screen of data but some times this command is also ignored.

Regards,
Prahlad Purohit