AVR-Chat

Hi All,

I'm running AT90S2313 at 6MHz. I calculated the UBRR value to be 38 
for baud 9600. The actual baud would be 9615.38 would that be okay 
according to the RS232 standards?

Regards,

Chetan

I'd say that's a small enough error to be tolerated by most chips. I think
2-3% error is fine.

By the way, RS232 is the standard for voltage levels only; it says nothing
about the bit timing.

-----Original Message-----
From: Chetan Bhargava [mailto:list1@bhargavaz.com]
Sent: Tuesday, March 23, 2004 5:58 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] UART baud rate at 6MHz


Hi All,

I'm running AT90S2313 at 6MHz. I calculated the UBRR value to be 38
for baud 9600. The actual baud would be 9615.38 would that be okay
according to the RS232 standards?

Regards,

Chetan




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Chetan Bhargava wrote:
> Hi All,
>
> I'm running AT90S2313 at 6MHz. I calculated the UBRR value to be 38
> for baud 9600. The actual baud would be 9615.38 would that be okay
> according to the RS232 standards?
>
> Regards,
>
> Chetan


It will work, except if the receiver speed goes further below 9600 bps.

In the past I made a text about the acceptable error offset, you can read it
at the end of http://www.ustr.net/8051pc/starting.shtml, search for "CLOCK
SPEED".


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