Tag Archives: pll

LPC812 on a 20MHz External Crystal

Because the NXP LPC800 clock options and the setup are somewhat confusing, I thought I would post this example. Here is my LPC812 dev board running on a 20MHz external crystal. The frequency counter is reading the clockout pin which … Continue reading

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NXP LPC812 Clocks and Timers

Oscillators and Clocks The System Oscillator, not to be confused with the System Clock, can be fed by an external source (XTAL pins or CLKIN pin) or from the 12MHz Internal Oscillator. The external sources are limited to a maximum … Continue reading

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