7.2.2 Frequency Measurement (FREQM)

Some PIC32CM family of devices include a Frequency Meter (FREQM) peripheral to measure the frequency of an external or internal clock signal with high accuracy and minimal CPU intervention, aiding in system calibration and ensuring timing accuracy. It is used for clock calibration, timekeeping, communication, instrumentation, and power metering.

The following are key features of the FREQM:

• Direct frequency measurement
• Selectable reference clock
• High resolution—Provides precise frequency readings, suitable for calibration, diagnostics, and clock monitoring
• Interrupt and event generation
• Low-power operation