Universal Serial Bus Features:
• USB V2.0 Compliant
• Crystal-less Full Speed (12 Mb/s) and Low-Speed
Operation (1.5 Mb/s)
• Supports Control, Interrupt, Isochronous and Bulk
Transfers
• Supports up to 32 Endpoints (16 Bidirectional)
• 1 Kbyte Dual Access RAM for USB
• On-Chip USB Transceiver

Special Microcontroller Features:
• Low-Power, High-Speed CMOS Flash Technology
• C Compiler Optimized Architecture for Re-Entrant
Code
• Power Management Features:
- Run: CPU on, peripherals on, SRAM on
- Idle: CPU off, peripherals on, SRAM on
- Sleep: CPU off, peripherals off, SRAM on
• Priority Levels for Interrupts
• Self-Programmable under Software Control
• 8 x 8 Single-Cycle Hardware Multiplier
• Extended Watchdog Timer (WDT):
- Programmable period from 4 ms to 131s
• Single-Supply In-Circuit Serial Programming™
(ICSP™) via Two Pins
• In-Circuit Debug (ICD) with Three Breakpoints via
Two Pins
• Optional dedicated ICD/ICSP Port (44-pin TQFP
Package Only)
• Wide Operating Voltage Range:
- F devices: 2.3V to 5.5V
- LF devices: 1.8V to 3.6V
• Flash Program Memory of 10,000 Erase/Write
Cycles Minimum and 20-year Data Retention