The GD32E503xx device belongs to the high performance line of GD32 MCU family. It is a new 32-bit general-purpose microcontroller based on the Arm® Cortex®-M33 core. The Cortex®-M33 processor is a 32-bit processor that possesses low interrupt latency and lowcost debug. The characteristics of integrated and advanced make the Cortex®-M33 processor suitable for market products that require microcontrollers with high performance and low power consumption. The processor is based on the ARMv8 architecture and supports a powerful and scalable instruction set including general data processing I/O control tasks, advanced data processing bit field manipulations and DSP. The GD32E503xx device incorporates the Arm® Cortex®-M33 32-bit processor core operating at up to 180 MHz frequency with Flash accesses 0~4 waiting time to obtain maximum efficiency. It provides up to 512 KB embedded Flash memory and up to 128 KB SRAM memory. An extensive range of enhanced I/Os and peripherals connected to two APB buses. The devices offer three 12-bit ADCs, two DACs, up to nine general 16-bit timers, a general 32-bit timer, two basic timers, two PWM advanced timers, as well as standard and advanced communication interfaces: up to three SPIs, three I2Cs, six USARTs, two I2Ss, a SDIO, an USBD and two CANs. Additional peripherals as super high-resolution Timer (SHRTIMER), EXMC interface, Serial/Quad Parallel Interface (SQPI) are included. The device operates from a 1.62 to 3.6 V power supply and available in –40 to +85 °C temperature range. Several power saving modes provide the flexibility for maximum optimization between wakeup latency and power consumption, an especially important consideration in low power applications. The above features make the GD32E503xx devices suitable for a wide range of applications, especially in areas such as industrial control, motor drives, user interface, power monitor and alarm systems, consumer and handheld equipment, gaming and GPS, E-bike, optical module and so on