Datasheet Atmel AT90USB647-MU

Features
• High performance, low power AVR® 8-bit Microcontroller
• Advanced RISC architecture • • • • • • – 135 powerful instructions – most single clock cycle execution
– 32 × 8 general purpose working registers
– Fully static operation
– Up to 16MIPS throughput at 16MHz
– On-chip 2-cycle multiplier
Non-volatile program and data memories
– 64/128Kbytes of in-system self-programmable flash
• Endurance: 100,000 write/erase cycles
– Optional Boot Code section with independent lock bits
• USB boot loader programmed by default in the factory
• In-system programming by on-chip boot program hardware activated after
reset
• True read-while-write operation
• All supplied parts are pre-programed with a default USB bootloader
– 2K/4K (64K/128K flash version) bytes EEPROM
• Endurance: 100,000 write/erase cycles
– 4K/8K (64K/128K flash version) bytes internal SRAM
– Up to 64Kbytes optional external memory space
– Programming lock for software security
JTAG (IEEE std. 1149.1 compliant) interface
– Boundary-scan capabilities according to the JTAG standard …