Lpc2000

Hi Robert,

is there any plan to use the fractional baudrate generation in the booter,
so you can boot e.g. even at 921 kbit/s with a 12 MHz oscillator ?
Theoretically it should be possible, hardware is supporting it...

Regards,

         Martin

----- Original Message ----- 
From: "philips_apps" <philips_apps@...>
To: <lpc2000@yahoogroups.com>
Sent: Friday, November 18, 2005 12:12 AM
Subject: [lpc2000] Re: LPC214x crystal frequencies // ISP max baudrate 38.4 
kBaud using 12 MHz


> Confirmed
>
> 12 MHz  ->  max baudrate 38400
> 16 MHz  ->  max baudrate 19200
> 24 MHz  ->  max baudrate 38400
>
> Robert
>
> --- In lpc2000@yahoogroups.com, "seangra" <sgraham@o...> wrote:
>>
>> Based on my calculations, 16MHz can only get to 19,200 (7% error
> at
>> 38,400) and 24MHz can get 38,400.  If you went up to 48MHz crystal
>> you could get 57,600.
>>
>> -- Sean
>>
>> --- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...>
>> wrote:
>> >
>> > 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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