1. Chip Introduction The GD32F103xx device is a 32-bit general-purpose microcontroller based on the ARM Cortex-M3 RISC core, offering the best balance in processing power, reduced power consumption, and peripheral integration. The Cortex-M3 is a next-generation processor core tightly coupled with a Nested Vectored Interrupt Controller (NVIC), SysTick timer, and advanced debug support. The GD32F103xx integrates an ARM Cortex-M3 32-bit processor core operating at 108 MHz, with zero-wait-state flash access for maximum efficiency. It provides up to 3MB of on-chip flash memory and up to 96KB of SRAM. A wide range of enhanced I/Os and peripherals are connected to two APB buses. The device offers up to three 12-bit ADCs, up to two 12-bit DACs, up to ten general-purpose 16-bit timers, two basic timers plus two PWM advanced timers, as well as standard and advanced communication interfaces: up to three SPIs, two I²Cs, three USARTs, two UARTs, two IISs, one USB, one CAN, and one SDIO. The device operates with a power supply of 2.6 to 3.6V and a temperature range of -40 to +85°C. 2. Product Features The Cortex-M3 processor is ARM’s latest-generation processor for embedded systems. It was developed to provide a low-cost platform that meets the requirements of MCU implementations, with reduced pin count and low power consumption while delivering outstanding computational performance and advanced system interrupt response. The 32-bit ARM Cortex-M3 processor core operates at up to 108 MHz, featuring single-cycle multiplication and hardware division, an integrated Nested Vectored Interrupt Controller (NVIC), and a 24-bit SysTick timer. The Cortex-M3 processor is based on the ARM V7 architecture and supports the Thumb and Thumb-2 instruction sets. The Cortex-M3 also provides the following system peripherals: an internal bus matrix connected to the I-code bus, D-code bus, system bus, Private Peripheral Bus (PPB), and debug access. Nested Vectored Interrupt Controller (NVIC). Flash Patch and Breakpoint (FPB). Data Watchpoint and Trace (DWT). Instrumentation Trace Macrocell (ITM). Embedded Trace Macrocell (ETM). Serial Wire JTAG Debug Port (SWJ-DP). Trace Port Interface Unit (TPIU). Memory Protection Unit (MPU). For example, in small smart devices, the Cortex-M3 processor can achieve efficient operation with its low power consumption and high performance; in industrial control applications, its exceptional interrupt response capability ensures system stability and reliability.