Microchip 微控制器, ATSAM系列, 64引脚, QFN封装, ARM Cortex-M3, 256 kB内存

The SAM3S4B 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.

Microcontroller Features
Core
ARM7TDMI® ARM® Thumb® Processor 32-bit RISC Architecture
High-density 16-bit Instruction Set
EmbeddedICE™ In-circuit Emulation, Debug Communication Channel Support
Memories
128Kb, Organized in 512 Pages of 256 Bytes (Single Plane)
32Kb embedded SRAM, Single-cycle Access at Maximum Speed
MC
MPU
System
Embedded 1.8V Regulator, Drawing up to 100 mA for the Core and External Components
Based on Power-on Reset Cells and Low-power Factory-calibrated Brownout Detector
Low-power RC Oscillator, 3 to 20MHz On-chip Oscillator and One PLL
PMC
AIC
Two-wire UART and Support for Debug Communication Channel interrupt, Programmable ICE Access Prevention
20-bit Programmable Counter