Questions about Character LCD and AT89S52....

[kit_714]

viva questions on at89s52

Hi All,

i have a problem when interfacing 16x2 character LCD and AT89S52....

when i try to power up the system, the LCD cannot show the character which i write in the program...

However, when i try to reset the MCU...LCD shows the correct character...

what are the possible reasons for this strange phenomenon??

Remarks : i am using Port 2 as databus and 3 pins of Port 0 for control the RS, WR and EN pins...

Thanks in advanced...

Kit

 

[manish12]

at start use delay of 20ms ,

make port po pull up by 10k resistor network,

try contrast control preset for better view .

 

[kit_714]

Hi,

i tried to give a delay when initializing LCD in the program...

however...still has the same problem...

do i need to give delay by hardware circuitry??

is there any method that can solve the problem??

Thanks for your kindly help ...

Added after 2 hours 40 minutes:

One more questions....

Can it be solved by watchdog timer??

If yes...can anyone send me the source code to initialize the watchdog timer?

Thanks a lot!

 

[nandhu015]

Hai here is a simple code for driving 2 x 16 lcd.


**broken link removed**


check the timings in the initilaisation code. (all commands until clear lcd)


Regards
Nandhu