lpcware

Oscillators

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by coatesm on Thu Oct 07 03:57:02 MST 2010
Hello,

I'm currently a little confused, the user manual for the LPC11xx devices suggests that there are 3 oscillators built into the device, the IRC oscillator, the watchdog oscillator and the system oscillator.  I can't seem to find what frequency the "system oscillator" is?  The "SYSOSCCTRL" register allows us to select a frequency range for this oscillator, and to bypass it, but I cannot find a way of setting the frequency to a known value?  Is it perhaps the case that the "system oscillator" is in fact a buffer for an external crystal input and can be bypassed to enable use of an external digital clock signal?

Thanks

Martin

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