Features High-performance, Low-power 32-bit Atmel AVR Microcontroller Compact Single-cycle RISC Instruction Set Including DSP Instructions Read-modify-write Instructions and Atomic Bit Manipulation Performance Up to 64DMIPS Running at 50MHz from Flash (1 Flash Wait State) Up to 36DMIPS Running at 25MHz from Flash (0 Flash Wait State) Memory Protection Unit (MPU) Secure Access Unit (SAU) providing User-defined Peripheral Protection 32-bit Atmel picoPower Technology for Ultra-low Power Consumption Multi-hierarchy Bus System AVR High-performance Data Transfers on Separate Buses for Increased Performance 12 Peripheral DMA Channels improve Speed for Peripheral Communication Microcontroller Internal High-speed Flash 256Kbytes, 128Kbytes, and 64Kbytes Versions Single-cycle Access up to 25MHz FlashVault Technology Allows Pre-programmed Secure Library Support for End ATUC256L3U User Applications ATUC128L3U Prefetch Buffer Optimizing Instruction Execution at Maximum Speed 100,000 Write Cycles, 15-year Data Retention Capability ATUC64L3U Flash Security Locks and User-defined Configuration Area Internal High-speed SRAM, Single-cycle Access at Full Speed ATUC256L4U 32Kbytes (256Kbytes and 128Kbytes Flash) and 16Kbytes (64Kbytes Flash) Interrupt Controller (INTC) ATUC128L4U Autovectored Low-latency Interrupt Service with Programmable Priority External Interrupt Controller (EIC) ATUC64L4U Peripheral Event System for Direct Peripheral to Peripheral Communication System Functions Power and Clock Manager SleepWalking Power Saving Control Internal System RC Oscillator (RCSYS) 32 KHz Oscillator Multipurpose Oscillator, Phase Locked Loop (PLL), and Digital Frequency Locked Loop (DFLL) Windowed Watchdog Timer (WDT) Asynchronous Timer (AST) with Real-time Clock Capability Counter or Calendar Mode Supported Frequency Meter (FREQM) for Accurate Measuring of Clock Frequency Universal Serial Bus (USBC) Full Speed and Low Speed USB Device Support Multi-packet Ping-pong Mode Six 16-bit Timer/Counter (TC) Channels External Clock Inputs, PWM, Capture, and Various Counting Capabilities 36 PWM Channels (PWMA) 12-bit PWM with a Source Clock up to 150MHz Four Universal Synchronous/Asynchronous Receiver/Transmitters (USART) Independent Baudrate Generator, Support for SPI Support for Hardware Handshaking 32142D06/2013ATUC64/128/256L3/4U One Master/Slave Serial Peripheral Interface (SPI) with Chip Select Signals Up to 15 SPI Slaves can be Addressed 2 Two Master and Two Slave Two-wire Interfaces (TWI), 400kbit/s I C-compatible One 8-channel Analog-to-digital Converter (ADC) with up to 12 Bits Resolution Internal Temperature Sensor Eight Analog Comparators (AC) with Optional Window Detection Capacitive Touch (CAT) Module Hardware-assisted Atmel AVR QTouch and Atmel AVR QMatrix Touch Acquisition Supports QTouch and QMatrix Capture from Capacitive Touch Sensors QTouch Library Support Capacitive Touch Buttons, Sliders, and Wheels QTouch and QMatrix Acquisition Audio Bitstream DAC (ABDACB) Suitable for Stereo Audio Inter-IC Sound (IISC) Controller 2 Compliant with Inter-IC Sound (I S) Specification On-chip Non-intrusive Debug System Nexus Class 2+, Runtime Control, Non-intrusive Data and Program Trace aWire Single-pin Programming Trace and Debug Interface, Muxed with Reset Pin NanoTrace Provides Trace Capabilities through JTAG or aWire Interface 64-pin TQFP/QFN (51 GPIO Pins), 48-pin TQFP/QFN/TLLGA (36 GPIO Pins) Six High-drive I/O Pins (64-pin Packages), Four High-drive I/O Pins (48-pin Packages) Single 1.62-3.6V Power Supply 2 32142D06/2013