Liangxu Linux

Nov 4, 2025 · Fundamentals

How to Enable and Use Cortex‑M DWT CYCCNT for Precise Cycle Counting

This guide explains the DWT tracing component in Cortex‑M processors, details the CYCCNT register’s precision and limits, and provides step‑by‑step instructions with register definitions and multiple code examples for enabling, resetting, starting, stopping, and reading the cycle counter.