[time-nuts] Pictic II mods
Bob Camp
lists at rtty.us
Sat Jul 3 01:17:03 UTC 2010
Hi
A lot depends on just what you worry about. Most clock specs for serial com are in the 0.01 to 0.1% range.
Bob
On Jul 2, 2010, at 9:02 PM, Chuck Harris wrote:
> The PIC's internal silicon clock is better than 1% over the entire industrial
> voltage and temperature range. They are accurate enough.
>
> -Chuck Harris
>
> Bob Camp wrote:
>> Hi
>>
>> I believe he's using the internal clock on the PIC. It's not super accurate,
>> so running a lot of data can be an issue.
>>
>> Bob
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Stanley Reynolds
>> Sent: Friday, July 02, 2010 3:41 PM
>> To: time-nuts at febo.com
>> Subject: [time-nuts] Pictic II mods
>>
>> Looking at Richard's code in PICTICII.ASM :
>>
>> bsf TXSTA,BRGH ;set USART hi speed mode
>> movlw D'51' ;set async rate at 9600 baud (51. for
>> 8
>> MHz int, BRGH=1)
>> movwf SPBRG
>>
>> Then '25' would be 19,200 baud
>> and '12' would be 38,400 baud
>>
>> Need to test this but could be a way to get more data out.
>>
>> Stanley
>
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