●Overview
●The ATmega8U2/16U2/32U2 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8U2/16U2/32U2 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.
●Features
●• High Performance, Low Power AVR® 8-Bit Microcontroller
●• Advanced RISC Architecture
●– 125 Powerful Instructions – Most Single Clock Cycle Execution
●– 32 x 8 General Purpose Working Registers
●– Fully Static Operation
●– Up to 16 MIPS Throughput at 16 MHz
●• Non-volatile Program and Data Memories
●– 8K/16K/32K Bytes of In-System Self-Programmable Flash
●– 512/512/1024 EEPROM
●– 512/512/1024 Internal SRAM
●– Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM
●– Data retention: 20 years at 85C/ 100 years at 25OC(1)
●– Optional Boot Code Section with Independent Lock Bits
●In-System Programming by on-chip Boot Program hardware-activated after reset
●True Read-While-Write Operation
●– Programming Lock for Software Security
●• USB 2.0 Full-speed Device Module with Interrupt on Transfer Completion
●– Complies fully with Universal Serial Bus Specification REV 2.0
●– 48 MHz PLL for Full-speed Bus Operation : data transfer rates at 12 Mbit/s
●– Fully independant 176 bytes USB DPRAM for endpoint memory allocation
●– Endpoint 0 for Control Transfers: from 8 up to 64-bytes
●– 4 Programmable Endpoints:
●IN or Out Directions
●Bulk, Interrupt and IsochronousTransfers
●Programmable maximum packet size from 8 to 64 bytes
●Programmable single or double buffer
●– Suspend/Resume Interrupts
●– Microcontroller reset on USB Bus Reset without detach
●– USB Bus Disconnection on Microcontroller Request
●• Peripheral Features
●– One 8-bit Timer/Counters with Separate Prescaler and Compare Mode (two 8-bit PWM channels)
●– One 16-bit Timer/Counter with Separate Prescaler, Compare and Capture Mode (three 8-bit PWM channels)
●– USART with SPI master only mode and hardware flow control (RTS/CTS)
●– Master/Slave SPI Serial Interface
●– Programmable Watchdog Timer with Separate On-chip Oscillator
●– On-chip Analog Comparator
●– Interrupt and Wake-up on Pin Change
●• On Chip Debug Interface (debugWIRE)
●• Special Microcontroller Features
●– Power-On Reset and Programmable Brown-out Detection
●– Internal Calibrated Oscillator
●– External and Internal Interrupt Sources
●– Five Sleep Modes: Idle, Power-save, Power-down, Standby, and Extended Standby
●• I/O and Packages
●– 22 Programmable I/O Lines
●– QFN32 (5x5mm) / TQFP32 packages
●• Operating Voltages
●– 2.7 - 5.5V
●• Operating temperature
●– Industrial (-40°C to +85°C)
●• Maximum Frequency
●– 8 MHz at 2.7V - Industrial range
●– 16 MHz at 4.5V - Industrial range
●Note: 1. See “Data Retention” on page 6for details.
