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[SOLVED] What SPBRG setting to use for PIC(16F87xA with 8MHz Xtal in Async Mode(BRGH=1)

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gl1

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Hi Guys,
What value should i use in SPBRG for PIC 16F87xA with 8MHz Xtal,
I want to communicate with serial port at 9600 Baud, should i try use setting for 10MHz Xtal i.e. 64.
Or is it possible to use 8MHZ Xtal and achieve serial comms at 9600?


Thanks
 

You should not only depend on SPBRG settings. You should set your clock settings to make sure it is 8MHz. Then, set the SPBRG. All these you can find in the PIC datasheet.
 
The datasheet has the formulas:

For BRGH=0:
SPBRG = (Fosc/(64 x Baud)) - 1

For BRGH=1:
SPBRG = (Fosc/(16 x Baud)) - 1

In your case, Fosc=8000000 and Baud=9600.
 
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    gl1

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excellent thanks "upand_at_them"

---------- Post added at 00:29 ---------- Previous post was at 00:27 ----------

excellent, thanks "upand_at_them"
 

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