LPC55S6x Arm® Cortex®-M33 Microcontrollers NXP Semiconductors LPC55S6x Arm® Cortex®-M33 Microcontrollers (MCUs) feature dual Arm cores and Arm TrustZone® technology for industrial, building automation, Internet of Things (IoT) edge computing, diagnostic equipment, and consumer electronics applications. These devices feature advanced security features based on the Armv8-M architecture with a low-power 40nm embedded flash process.