I've checked the archives, and Googled the subject, but I cannot find a 
good example of ASM code and circuit for dimming the backlight on a 1602 
LCD. I know people have done it via PWM, but could use some good 
detailed info on how.

I also see there is an article in the archives on how to control the 
contrast that uses negative voltages. Is that really necessary? Wouldn't 
  a voltage 0-5V be all that is needed for that?

I'm using the PIC18F4520.

Thanks,
Joe M.
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