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Maximum Input Frequency of LPC81x?

Question asked by Daniel Vibbert on Jan 10, 2019
Latest reply on Jan 10, 2019 by jeremyzhou

I'm trying to make a high frequency counter out of an LPC81x. I can use an external crystal to make the LPC81x run at 24 MHz, but I'd like to count the frequencies of square waves in the 100MHz-200MHz range. Can I configure the SCT and its prescalers to count faster than the bus clock, or do I need to use a clock divider chip external to the LPC81x? I cannot find the dynamic characteristics of the microcontroller's inputs in either the UM10601 LPC81x User Manual or the LPC81x datasheet.

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