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Message

Re: LPC214x crystal frequencies // ISP max baudrate 38.4 kBaud using 12 MHz

2005-11-17 by philips_apps

All,

based on the algorithm the bootloader uses to determine the 
baudrate, as Joel already found out, it is correct that the max 
baudrate for 12 MHz is 38400 Baud. 

Will do some additional tests to determine the baudrates for 16 MHz 
and 24 MHz but we assume that 12 MHz will be the most used crystal 
as it provides functionality for USB and enables the 60 MHz max. CPU 
speed as well. 

Sorry for not providing the appropriate values in the table for the 
ISP, will update with the next reloease of the Users Manual but that 
might still take a little while. 

Robert

--- In lpc2000@yahoogroups.com, "Joel Winarske" <joelw@i...> wrote:
>
> > To get the 48 MHz necessary for the LPC214x USB, you must use a 
crystal
> > of 12.0 MHz, 16.0 MHz, or 24.0 MHz.  None of these frequencies 
are
> > mentioned in the manual table 291 that lists the possible ISP 
baud
> > rates with various crystal frequencies.  Can you use serial ISP 
with
> > 12/16/24 MHz, and with which baud rates?
> 
> At 12MHz the highest the Phillips Flash utility will connect is 
38.4k baud.
> I cannot connect running a higher baud. 
> 
> Joel
>

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