The SAM3S4C is a member of the Microchip's SAM3S series microcontrollers based on the high-performance 32-bit ARM Cortex-M3 RISC processor. It operates at a maximum speed of 64MHz and features 256KB of flash memory and 48KB of SRAM.The extensive peripheral set includes a Full Speed USB device port with embedded transceiver, high-speed multimedia card interface for SDIO/SD/MMC, external bus interface featuring a static memory controller connecting to SRAM, PSRAM, NOR flash, LCD module and NAND flash, two USARTs, two UARTs, two TWIs (I2C), three SPIs, I2S, PWM timer, six 16-bit timers, RTC, 15-ch 12-bit ADC, 2-ch 12-bit DAC, and an analog comparator.The QTouch library offers an easy way to implement buttons, wheels, and sliders. The parallel data capture mode on the PIOs complements the external bus interface for data collection from external devices not compliant with standard memory read protocols, such as low-cost image sensors. DMA transfers the data to memory, offloading the CPU.It operates from 1.62V to 3.6V and is available in 100-pin QFP and QFN packages and is pin-to-pin compatible with the SAM3N4C.