Lpc2000

Radim,

the major difference is that you don't need to use a 14.756 MHz any
more to get to a 115200 (or for that matter any standard baudrate). 
The fractional baudrate generator is new to the LPC214x and for a
reason. To run the USB, you need a value for the clock like 12 MHz or
16 MHz. This does not compute very well with 115200 serial baudrate if
you don't have a fractional baudrate generator.
I hope there will be such a BR-generator also on the CAN chips some
time soon as they face the same problem.

Bob

--- In lpc2000@yahoogroups.com, "radim100" <radim100@y...> wrote:
>
> --- In lpc2000@yahoogroups.com, "Joel Winarske" <joelw@i...> wrote:
> >
> > I just posted a simple Win32 cmd line tool to calculate the 
> optimum register 
> > settings for a LPC214x UART peripheral.
> > I am not aware if all the LPC2k UART peripherals are the same or 
> not.  If so 
> > great.  I was working against the LPC2148 user manual.
> > 
> > It seems the equation in the user manual to calculate the baud 
> rate is 
> > incorrect.
> > 
> > It should be:
> > Baudrate = 
> > (PCLK/(16*(256*PRE_SCALE_MSB+PRE_SCALE_LSB)))*(MulVl/
> (MulVal+DivAddVal))
> > 
> > opposed to:
> > Baudrate = 
> > (PCLK/(16*(16*PRE_SCALE_MSB+PRE_SCALE_LSB)))*(MulVl/
> (MulVal+DivAddVal))
> > 
> > I replicated the user manual example baud table using my software 
> with 
> > modified equation.
> > 
> > Minor typo in the user manual:  The percent error value for the 
> optimized 
> > 56000 baud is incorrect, it should read 0.1600 opposed to 0.0160.
> > 
> > I hope you find it useful.
> > 
> > If can be found in:  
> http://groups.yahoo.com/group/lpc2000/files/Tools/
> > 
> > 
> > Regards,
> > Joel Winarske
> > Systems Architect
> > Independent Electronics, Inc.
> > V 707.320.4271
> > M 408.203.2770
> > F 408.516.5978
> > www.indyelectronics.com
> >
> Hi, 
>  There is already similar tool in file section in file LPCUST.zip.
>  Is your utility different in calculations ? 
>  Radim.
>