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Relaton between Software Clock and Fuse bit

 
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pinkfloyd11

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Joined: 02 Jul 2007
Posts: 248

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PostPosted: Tue Nov 27, 2007 4:40 pm    Post subject: Relaton between Software Clock and Fuse bit Reply with quote

Dear Friends

I have written a program that write on RS232 on ATMega8515 placed directly on STK500 Board.

I use software clock (XTAL1 jumper close; OSCSEL jumper close on 1-2)
set by AVR Studio board tab on 3.686 MHz

Now which fuse bit I should use on ATMega8515 for have RS232 communication work good (because I read strange word on rs232 an I know that this is clock error...)

If max software freq. is 3.686MHz why in list there are also 6 MHz, 8 MHz ecc and which is the difference between Int. Clcok, Ext Clock, Int osc ecc??

Thanks
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Luciano

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Joined: 29 Nov 2004
Posts: 3149
Location: Italy

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PostPosted: Tue Nov 27, 2007 6:24 pm    Post subject: Reply with quote

Hi Giuseppe,

Read the ATmega8515 datasheet from page 34 to page 40.

ATmega8515 datasheet:
http://www.atmel.com/dyn/resources/prod_documents/doc2512.pdf

Best regards,

Luciano
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