Char. LCD and 18F452 on 20 MHz not work

[samettin]

Might want to also keep in mind that the PLL doesn't work above 10Mhz. The max speed of the PIC is 40Mhz (10 x 4xPLL). Try as you might, you won't get the PIC to run at 160Mhz! (It would be nice, but it won't work )

160Mhz?
Sorry i dont see.

With 4 MHz and PLL 4X4 = 16 MHz.
20 MHz is without PLL. This osc conf. is XT.