Lpc2000

--- In lpc2000@yahoogroups.com, Peter Jakacki <peterjak@...> wrote:

> Has anyone had experience with sharing the crystal over multiple
> LPC21xx oscillators? I have a design where I am multidropping 2101s
> together over the SPI bus (slave listen, master to talk). It seems
> a bit over the top to have a separate crystal for each chip though
> and I am looking at running the XTAL out from one chip to the XTAL
> in of another and so on (to reduce loading). Of course, the line
> length will be short and shielded.
> 
> Has anyone actually done this?

I haven't, but when I needed 11.0592 MHz for both an LPC2148 and 
another chip, I had a crystal on the LPC2148, and used the PLL and the 
PWM timer to get a 11.0592 MHz square on a PWM output.  (The other chip 
needed TTL levels so I couldn't use the xtal signal directly.)

Karl Olsen