Microchip ATSAM4S4AA-AU, 16bit ARM Cortex M4 Microcontroller MCU, Flash, 120MHz, 256 kB Flash, 48-Pin LQFP

The Microchip Atmel® SMART SAM4S series is a member of a family of Flash microcontrollers based on the high-performance 32-bit ARM® Cortex®-M4 RISC processor. It operates at a maximum speed of 120 MHz and features up to 2048 Kbytes of Flash, with optional dual-bank implementation and cache memory, and up to 160 Kbytes of SRAM.

ARM Cortex-M4 with 2 Kbytes of cache running at up to 120 MHz
Memory Protection Unit (MPU)
DSP Instruction Set
Thumb®-2 instruction set
Up to 2048 Kbytes embedded Flash with optional dual-bank and cache memory, ECC, Security Bit and Lock Bits
Up to 160 Kbytes embedded SRAM
16 Kbytes ROM with embedded boot loader routines (UART, USB) and IAP routines
8-bit Static Memory Controller (SMC): SRAM, PSRAM, NOR and NAND Flash support