H4 vs HS

acm45 · Joined: 29 Dec 2008 Posts: 18 Location: Italy

No, change the crystal is not a problem for the LCD if you configure
#use delay(...)

The only solution I can't test is the one from Ttelmah. I can't add a resistor in my pcb.

Thank you all guys!
I will change the crystal with a 40MHz.

bkamen · Posted: Mon Dec 21, 2009 2:43 am

I don't think that will work.

If you look in the datasheet, you can supply a 40MHz clock from an external oscillator.

However, if you plan on using a crystal, the max it will run is 25MHz.

See DS39616C-page 354

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

Ttelmah · Guest

The alternative to a series resistor, is to get a crystal with a lower 'gain'. Look at the Microchip application note, about selecting the right crystal, and try a different one.
Also, though 'brutal', you can always cut a track to add a resistor.....

Best Wishes