[time-nuts] Pictic II mods

Bob Camp lists at rtty.us
Fri Jul 2 21:17:03 EDT 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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