4241B–MP3–07/04
MP3
Microcontrollers
AT89C51SND1
UART
Bootloader
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 produc-
tion is available from the Atmel web site.
Bootloader Revision Purpose of Modifications Date
Revision 1.0.0 New release increasing programming
speed
June 2002
Revision 1.1.0 Bug fix in boot process October 2002
1