The LPC43S5x/S3x are ARM Cortex-M4 based microcontrollers for embedded applications which include an ARM Cortex-M0 coprocessor， up to 1 MB of flash and 136 kB of on-chip SRAM， 16 kB of EEPROM memory， security features with AES engine， a quad SPI Flash Interface （SPIFI）， advanced configurable peripherals such as the State Configurable Timer （SCT） and the Serial General Purpose I/O （SGPIO） interface， two High-speed USB controllers， Ethernet， LCD， an external memory controller， and multiple digital and analog peripherals. The LPC43S5x/S3x operate at CPU frequencies of up to 204 MHz. The ARM Cortex-M4 is a 32-bit core that offers system enhancements such as low power consumption， enhanced debug features， and a high level of support block integration. The ARM Cortex-M4 CPU incorporates a 3-stage pipeline， uses a Harvard architecture with separate local instruction and data buses as well as a third bus for peripherals， and includes an internal prefetch unit that supports speculative branching. The ARM Cortex-M4 supports single-cycle digital signal processing and SIMD instructions. A hardware floating-point unit is integrated in the core. The ARM Cortex-M4 with floating-point unit is often referred to as M4F. The ARM Cortex-M0 coprocessor is an energy-efficient and easy-to-use 32-bit core which is upward code- and tool-compatible with the Cortex-M4 core. The Cortex-M0 coprocessor， designed as a replacement for existing 8/16-bit microcontrollers， offers up to 204 MHz performance with a simple instruction set and reduced code size