Re: [Sdcc-user] initialization of uart

[Jim P. <jim...@mi...>]

Hi Ori

I'm using a 20mhz crystal

Thanks Jim


> [Original Message]
> From: Ori Idan <or...@he...>
> To: <sdc...@li...>
> Date: 5/14/2005 6:15:27 PM
> Subject: Re: [Sdcc-user] initialization of uart
>
> Jim Peterson wrote:
>
> > Hi
> >  
> > I finally got my 87C52 mpu up and working and I appreciate all that
> > made comments relative to my previous posts regarding
> > " Problems getting started" My problem was hardware not software.
> >  
> > Now I'm attempting to communicate with the board via the serial port
> > and I would appreciate suggestions regarding the setting of the
> > baudrate. Since I'm terrible at assembly language but pretty good at
> > C++ I'm looking for help with this. I have a 20mhz crystal and am
> > looking for a 9600 baud rate.
> >  
> > Can anyone direct me to where I can find a routine to do this?
> >  
> > Thanks
> > Jim
>
> Setting baud rate is only setting few registers and bits so there is no
> need for assembly language.
>
> Baud rate is usually generated by timer 1 which is set to 8 bit auto
reload.
>
> I can look for this routine in my sources, what is the exact frequency
> of your crystal? so I can give you the right numbers.
>
> -- 
>
> Ori Idan
>
>
>
>
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