Hi, I'm a grad student working a project using an LPC2148 microcontroller. I need to know what the oscillation frequency of its (external) clock is.
This is the board I'm using, and here is the corresponding **broken link removed**. You can see the input for the clock, RTCX1, at the center left pin of the chip as drawn. There is also an oscillator right there labelled "Q2 32768".
This label led me to believe the oscillator frequency was 32.786 kHz or 32768 kHz, but page 18 in the
manual for my mcu (LPC2148) says "this microcontroller's internal oscillator circuit supports external crystals in the range of 1 MHz to 30 MHz only". Do I need to be doing some computation with the capacitors as well? Could you explain what I'm missing?
(To clarify and ensure that I'm understanding the manual, the frequency I'm trying to find is F_OSC from page 18 of the mcu
manual.)
(I'm a total newb to this stuff, obviously. Thanks a lot for your help.)
Ryan