oscillator problem

[Acetronics2]

didnt make a difference), the code im using is:

DEFINE OSC 10
 
ADCON1=%01111111
 
LCD_DB4         VAR PORTA.4
LCD_DB5         VAR PORTA.2
LCD_DB6         VAR PORTA.3
LCD_DB7         VAR PORTB.0
LCD_RS          VAR PORTA.0
LCD_E           VAR PORTA.1
LCD_Lines       CON 2    
LCD_DATAUS      CON 50 
LCD_COMMANDUS   CON 2000
 
INCLUDE "LCD_AnyPin.pbp"
 
PAUSE 200
 
LCDOUT $FE,1,$FE,2,"Hello World!"
 
END

Do you remember PORTA.4 is an open collector pin ... ???

... and you could use pause 500+ instead of 200. some displays are a bit lazy ...

[Kamikaze47]

Do you remember PORTA.4 is an open collector pin ... ???

... and you could use pause 500+ instead of 200. some displays are a bit lazy ...

I added a pullup resistor to PORTA.4

It's definitely the osc because if I leave it running for 15 mins or so it does eventually display "Hello World!" extremely slowly.

[Acetronics2]

I added a pullup resistor to PORTA.4

It's definitely the osc because if I leave it running for 15 mins or so it does eventually display "Hello World!" extremely slowly.

I think so ... now.
Xtals also can be a bit lazy ... depends on the " cut "

don't you have a 12 or 16 Mhz Xtal ... ( I recently saw a 18F overclocked @ 80 Mhz !!! ... ) 48 Mhz is easy, 64 might work.

Alain

[Kamikaze47]

I think so ... now.
Xtals also can be a bit lazy ... depends on the " cut "

don't you have a 12 or 16 Mhz Xtal ... ( I recently saw a 18F overclocked @ 80 Mhz !!! ... ) 48 Mhz is easy, 64 might work.

Alain

I just replaced it with a 16mhz which is working but that could just be because of the heating up. The test will be leaving it for half an hour and see if it still works. I'll post again then

[Kamikaze47]

it seems to be running happily at 64hmz

i dont understand why since i tried 2 different 10mhz crystals

[Acetronics2]

it seems to be running happily at 64hmz

i dont understand why since i tried 2 different 10mhz crystals

To be really quiet with that ...

I only buy my Xtals from Farnell, now ... per 100, price is nice.

Never more from a local dealer ...

Alain

[malc-c]

The only thing to watch when overclocking is that things like serial comms ad the like often wont work. I had an 18F4580 running on a 20Mhz xtal with the HS_PLL setting - whilst it wasn't probably running at 80Mhz, it was dammed fast - but non of my serial comms would work until I replaced the 20Mhz xtal with a 12Mhz one. (as spotted by Alain)

I was going to suggest that you tried using the xtal from the breadboard that you know was a proven crystal... but now you seem to of resolved the problem. - I have to agree with Alain, I would only purchase from a large component retailer (RS in my case).