Features ? Protocol – UART Used as a PhysICal Layer – Based on the Intel Hex-type Records – Autobaud ? In-System Programming – Read/Write Flash Memory – Read Device IDs – BLOCK Erase – 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 IDs – Block Erase – Read/Write Configuration Bytes – Bootloader Start Description This document describes the UART bootloader functionalities as well as the serial protocol to efficiently perform operations on the on-chip Flash memory. Additional information for the AT89C51SND1 product can be found in the AT89C51SND1 data sheet and the AT89C51SND1 errata sheet available on the Atmel web site, www.atmel.com. The bootloader software package (source code and binary) currently used for production is available from the Atmel web site.

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