STM32 ARM Cortex™-M3 Connectivity Line The STMicroelectronics STM32 ARM Cortex™-M3 Connectivity Line is a high-performance addition to the STM32 microcontroller (MCU) portfolio that introduces outstanding new features, including USB 2.0 OTG Full Speed 12Mbps, Ethernet MAC 10/100Mbps with Precise Time Protocol IEEE 1588 HW support, Dual CAN 2.0 Active, and Audio Class I2S. The MCUs in the STM32 Connectivity Line is designed for applications in which connectivity and real-time performance are a necessity: industrial control, control panels for security applications, and more. STMicroelectronics Connectivity Line MCUs feature 64 to 256KB on-chip Flash memory, up to 64KB SRAM, and 14 communication interfaces.