I can not figure out an LCD issue

[lilimike]

after reading over the thread I just saw this:

Using DEFINE OSC 20 I had erroneous results on the LCD, so it's obviously a timing issue with your 4MHz resonator

I took out my resonator and used the chips' internal oscillator but I get the same results so this rules out the resonator I was using.

When using LCD_AnyPin it works with 8 MHz but the timing is doubled, if I set to 4 MHz the timing is is ok and LCD is blank.

Furthermore using standard settings for LCD does not work at all settings for OSC.

Help!

[mackrackit]

The only suggestion I have now is to play with these lines.

DEFINE LCD_COMMANDUS 2000       ' Command delay time in us 
DEFINE LCD_DATAUS 50            ' Data delay time in us

Use the 4 MHZ OSC
DEFINE OSC 4

[malc-c]

after reading over the thread I just saw this:


I took out my resonator and used the chips' internal oscillator but I get the same results so this rules out the resonator I was using.

When using LCD_AnyPin it works with 8 MHz but the timing is doubled, if I set to 4 MHz the timing is is ok and LCD is blank.

Furthermore using standard settings for LCD does not work at all settings for OSC.

Help!

Mike,

That's why I included the statement. With a 20Mhz xtal and setting the define to 20 I got random parts of the text displayed. When I set the define to 48 it worked - why I don't know (I'm still a newb to a degree My guess is that the value is divided internally somewhere to set the timing, which is why in your case setting it to 8 works with a 4Mhz xtal