This document is the Atmel AT43USB320A datasheet, which introduces the features of the product, including 8-bit RISC microcontroller, USB function, external program memory, 512-byte data SRAM, 32 x 8 general-purpose working registers, 32 programmable I/O port pins, programmable serial UART, master/slave SPI serial interface, one 8-bit timer/counter with separate prescaler, one 16-bit timer/counter with separate prescaler and two PWMs, external and internal interrupt sources, programmable watchdog timer, 6 MHz oscillator with on-chip PLL, 5V operation with on-chip 3.3V power supply, 100-lead LQFP package
This manual describes the AT43USB320A 8‑bit AVR® RISC microcontroller, its integrated USB hub with one attached and four external ports, and the peripheral set including timers, UART, SPI, and programmable I/O. It details the device architecture, register file, and programming considerations.
The document includes pin configuration tables, signal descriptions, package information, electrical specifications, and ordering details, as well as contact information for Atmel regional offices.
| Microcontroller core | 8-bit AVR RISC |
|---|---|
| Package | 100‑lead LQFP |
| Operating voltage | 5 V (with on‑chip 3.3 V supply) |
| Oscillator | 6 MHz with on‑chip PLL |
| Data SRAM | 512 bytes |
| General‑purpose registers | 32 × 8‑bit |
| Programmable I/O pins | 32 pins |
| Timers | One 8‑bit Timer/Counter, one 16‑bit Timer/Counter with two PWMs |
| USB hub ports | 1 attached + 4 external ports |
It is supplied in a 100‑lead LQFP package.
The microcontroller operates at 5 V and includes an on‑chip 3.3 V power supply.
It provides 512 bytes of data SRAM.