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Discussion Groups
Discussion Groups | LPC2000 | FTDI's new FT232R as clock source
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
FTDI's new FT232R as clock source - Aryeh Eiderman - Dec 24 17:27:00 2005
Hi,
The new USB-to-UART chip from FTDI - FT232R -
have now all the features of SiLabs' CP210X
and one additional feature: 6/12/24/48 MHz
clock to drive an external microcontroller.
So my questions are:
1. Is this clock can be used on LPC2000 instead
of crystal?
2. If yes, how to connect it to LPC2000? To
leave XOUT of LPC2000 unconnected?
Thank You,
Aryeh
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
The new USB-to-UART chip from FTDI - FT232R -
have now all the features of SiLabs' CP210X
and one additional feature: 6/12/24/48 MHz
clock to drive an external microcontroller.
So my questions are:
1. Is this clock can be used on LPC2000 instead
of crystal?
2. If yes, how to connect it to LPC2000? To
leave XOUT of LPC2000 unconnected?
Thank You,
Aryeh
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
RE: FTDI's new FT232R as clock source - Joel Winarske - Dec 24 18:46:00 2005
> 1. Is this clock can be used on LPC2000 instead
> of crystal?
> 2. If yes, how to connect it to LPC2000? To
> leave XOUT of LPC2000 unconnected?
Excerpt from LPC214x manual:
"While an input signal of 50-50 duty cycle within a frequency range from
1 MHz to 50 MHz can be used by the LPC2141/2/4/6/8 if supplied to its input
XTAL1 pin, this microcontroller’s onboard oscillator circuit supports
external crystals in the range of 1 MHz to 30 MHz only. If the on-chip PLL
system or the boot-loader is used, the input clock frequency is limited to
an exclusive range of 10 MHz to 25 MHz."
It may vary depending on your choice of MCU, so check the particular MCU
user manual under the "Crystal Oscillator" section. Joel
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
> of crystal?
> 2. If yes, how to connect it to LPC2000? To
> leave XOUT of LPC2000 unconnected?
Excerpt from LPC214x manual:
"While an input signal of 50-50 duty cycle within a frequency range from
1 MHz to 50 MHz can be used by the LPC2141/2/4/6/8 if supplied to its input
XTAL1 pin, this microcontroller’s onboard oscillator circuit supports
external crystals in the range of 1 MHz to 30 MHz only. If the on-chip PLL
system or the boot-loader is used, the input clock frequency is limited to
an exclusive range of 10 MHz to 25 MHz."
It may vary depending on your choice of MCU, so check the particular MCU
user manual under the "Crystal Oscillator" section. Joel
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: FTDI's new FT232R as clock source - Aryeh Eiderman - Dec 24 20:33:00 2005
Thank You Joel!
I am using LPC2106.
In manual looks like the 214x but less described...
--- In lpc2000@lpc2..., "Joel Winarske" <joelw@i...> wrote:
>
> > 1. Is this clock can be used on LPC2000 instead
> > of crystal?
> > 2. If yes, how to connect it to LPC2000? To
> > leave XOUT of LPC2000 unconnected?
>
> Excerpt from LPC214x manual:
>
> "While an input signal of 50-50 duty cycle within a frequency range
from
> 1 MHz to 50 MHz can be used by the LPC2141/2/4/6/8 if supplied to
its input
> XTAL1 pin, this microcontroller's onboard oscillator circuit
supports
> external crystals in the range of 1 MHz to 30 MHz only. If the on-
chip PLL
> system or the boot-loader is used, the input clock frequency is
limited to
> an exclusive range of 10 MHz to 25 MHz."
>
> It may vary depending on your choice of MCU, so check the
particular MCU
> user manual under the "Crystal Oscillator" section. > Joel
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
I am using LPC2106.
In manual looks like the 214x but less described...
--- In lpc2000@lpc2..., "Joel Winarske" <joelw@i...> wrote:
>
> > 1. Is this clock can be used on LPC2000 instead
> > of crystal?
> > 2. If yes, how to connect it to LPC2000? To
> > leave XOUT of LPC2000 unconnected?
>
> Excerpt from LPC214x manual:
>
> "While an input signal of 50-50 duty cycle within a frequency range
from
> 1 MHz to 50 MHz can be used by the LPC2141/2/4/6/8 if supplied to
its input
> XTAL1 pin, this microcontroller's onboard oscillator circuit
supports
> external crystals in the range of 1 MHz to 30 MHz only. If the on-
chip PLL
> system or the boot-loader is used, the input clock frequency is
limited to
> an exclusive range of 10 MHz to 25 MHz."
>
> It may vary depending on your choice of MCU, so check the
particular MCU
> user manual under the "Crystal Oscillator" section. > Joel
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )