Yahoo Groups archive

Lpc2000

Index last updated: 2026-04-28 23:31 UTC

Message

Re: [lpc2000] Re: UART clock tolerance question.

2005-12-15 by Karsten Weiss

Hellop Dmitry,
usually one says, that a tolerance of approx. 2% betreen the baud rate 
of two communicating devices will be acceptable in general.
Regards,
Karsten

Guillermo Prandi schrieb:

>Most likely it will. It is not exactly "if LPC will handle it", but 
>more like whether the two parties will understand each other. In a 
>perfect world, you just need to multiply a bit's time times the number 
>of bits in your word (7, 8?) plus the start and the stop bits and see 
>if the stop bit ends reasonably in range (bits are compared at their 
>mid-point). Since the world is not so perfect, you must take into 
>account the rise and fall ramps of your transmission line as well. If 
>both devices are 3.3V or 5V and in the same board, you can reasonably 
>ignore the rise and fall ramps, since they are so sharp.
>
>Guille
>
>--- In lpc2000@yahoogroups.com, "diwilru" <ddiky@a...> wrote:
>  
>
>>Fellows,
>>
>>In my application the best I can get is 115384 Baud for uart0 whereas 
>>    
>>
>data source has 
>  
>
>>speed of 115200 exactly. The error is about 0.16%. The question is - 
>>    
>>
>will lpc (2148) 
>  
>
>>handle it?
>>
>>Thanks in advance, 
>>Dmitry.
>>
>>    
>>
>
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>  
>

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.