Char. LCD and 18F452 on 20 MHz not work

[samettin]

Char. LCD and 18F452 on 4 MHz working, but on 20 MHz not work.

Please help me.

define LCD_BITS 4
DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTC
DEFINE LCD_RSBIT 6
DEFINE LCD_EREG PORTC
DEFINE LCD_EBIT 7
DEFINE LCD_LINES 4
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50


LCDOUT $FE,1,"HELLO WORLD"

[mackrackit]

Did you tell PBP that you are using 20 mhz

DEFINE OSC 20

[samettin]

Did you tell PBP that you are using 20 mhz

DEFINE OSC 20

Yes mackrackit.
And OSC = HS
But PBP not compile 18f452 to hex, MPASM compiling to hex. And MPASM compiling on (default) 4 MHz only.

[mackrackit]

Yes mackrackit.

But PBP not compile 18f452 to hex, MPASM compiling to hex. And MPASM compiling on (default) 4 MHz only.

MPASM is required for 18s.
How do you know it is doing 4 MHz? Did you change the congig (*.inc) to HS?

[samettin]

I m sorry, i changed my message

I did change OSC to HS.

LCD vorking with 18F452 on 4 MHz xtal and osc config = XT.

Problem is, if PLL enable with 4 MHz XTAL, or 20 MHz with osc config=HS then.

[mackrackit]

Could you post all of the code and config, not what you think the configs are set for, but a copy paste of the *.inc.

[skimask]

Problem is, if PLL enable with 4 MHz XTAL, or 20 MHz with osc config=HS then.

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 )