This document describes the features of the Atmel AT43USB355 microcontroller, including 83 ns instruction cycle time, USB hub, 24 KB program memory, 32 general-purpose working registers, etc.
This handbook describes the AT43USB355 8‑bit AVR® RISC microcontroller, highlighting its 24 KB program memory, 1 KB data SRAM, 12‑channel 10‑bit ADC, and integrated full‑speed USB 2.0 hub with one attached function and two external ports. It also details the 64‑lead LQFP package, 6 MHz oscillator with on‑chip PLL, and 5 V operation with an on‑chip 3.3 V regulator.
The document includes pin‑out diagrams, pin assignment tables, signal descriptions, and an architectural overview of the core, timers, PWM, SPI, and USB peripherals. Revision history and ordering information are provided at the end of the handbook.
| Program Memory | 24 KB |
|---|---|
| Data SRAM | 1 KB |
| ADC Channels | 12‑channel 10‑bit |
| Package | 64‑lead LQFP |
| Oscillator Frequency | 6 MHz with on‑chip PLL |
| Operating Voltage | 5 V (with on‑chip 3.3 V supply) |
| Instruction Cycle Time | 83 ns |
It includes a full‑speed USB 2.0 hub with one attached function and two external ports.
The device has a 12‑channel ADC with 10‑bit resolution.
The microcontroller operates at 5 V and includes an on‑chip 3.3 V power supply.