Hi,

OK fear enough, my mistake.

But I still don't see how I configure the device to run at 20 Mhz

Kind Regards
Grant Brown

Jan-Erik Soderholm wrote:
> Grant Brown wrote:
>   
>> Hi Jan
>>
>> Read the data sheet, gee thanks for the tip.
>>
>>     
>>>> Not possible. The data sheet is perfectly clear on this.
>>>>         
>> The data sheet that I have for the PIC18F45J10 says 20Mhz crystals are 
>> OK and have been tested with the device.
>>     
>
> But that wasn't what you asked about :
>
>  >> I have a external 20Mhz crystal as the clock input and wish to run
>  >> the device at its maximum speed of 40Mhz
>
> I read that as that you want to *both* use a 20 MHz crystal
> *and* run at 40 Mhz at the same time. Was that wrong !?
>
> My best tip is still to re-read the datasheet.
>
> If you want to run at 40 MHz, you must either supply an
> externa 40 MHz clock or use a 10 Mhz crystal with
> the 4x PLL (the most common setup).
>
> Using a 20 MHz crystal, you can only run at 20 MHz.
>
> Jan-Erik.
>
>   
>> Table 2-2   page 26
>>
>> But anyway thanks for taking the time to respond.
>>
>> Kind Regards
>> Grant Brown
>>
>> Jan-Erik Soderholm wrote:
>>     
>>> Grant Brown wrote:
>>>   
>>>       
>>>> Hi list,
>>>>
>>>> Starting to use a PIC18F45J10 for the first time.
>>>>     
>>>>         
>>> Right, start with the datasheet, in particular the chapter
>>> on the oscillator configurations. It's just a couple
>>> of pages.
>>>
>>>   
>>>       
>>>> I have a external 20Mhz crystal as the clock input and wish to run 
>>>> the device at its maximum speed of 40Mhz
>>>>     
>>>>         
>>> Not possible. The datasheet is perfectly clear on this.
>>>
>>> Jan-Erik.
>>>   
>>>       

-- 
Kind Regards
Grant Brown

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