Features • Protocol – USB Used as a Physical Layer – Device Firmware Upgrade Class Compliant – Auto-Frequency Detection • In-System Programming – Read/Write Flash Memory – Read Device ID – Full-chip Erase – Read/Write Configuration Bytes – Security Setting from ISP Command – Remote Application Start Command • In-Application Programming/Self-Programming – Read/Write Flash Memory – Read Device ID – Block Erase – Read/Write Configuration Bytes – Bootloader Start Description This document describes the USB bootloader functionalities as well as the USB protocol to efficiently perform operations on the on-chip Flash memory. Additional information on the AT89C51SND1 product can be found in the AT89C51SND1 datasheet and the AT89C51SND1 errata sheet available on the Atmel web site. The bootloader software (binary file) currently used for production is available from the Atmel web site.
