Datasheet

Table Of Contents
30. FREQM – Frequency Meter
30.1 Overview
The Frequency Meter (FREQM) can be used to accurately measure the frequency of a clock by
comparing it to a known reference clock.
30.2 Features
Ratio can be measured with 24-bit accuracy
Accurately measures the frequency of an input clock with respect to a reference clock
Reference clock can be selected from the available GCLK_FREQM_REF sources
Measured clock can be selected from the available GCLK_FREQM_MSR sources
30.3 Block Diagram
Figure 30-1. FREQM Block Diagram
ENABLE
VALUE
REFNUM INTFLAG
GCLK_FREQM_REF
GCLK_FREQM_MSR
DONE
START
COUNTER
TIMER
CLK_MSR
CLK_REF
EN
EN
30.4 Signal Description
Not applicable.
30.5 Product Dependencies
In order to use this peripheral, other parts of the system must be configured correctly, as described below.
SAM D5x/E5x Family Data Sheet
FREQM – Frequency Meter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 831