AT89C51SND1

The command described below allows to start the application directly from the bootloader upon a specific command reception.
Two options are possible:
• Start the application with a reset pulse generation (using watchdog).When the device receives this command, the watchdog is enabled and the bootloader enters a waiting loop until the watchdog resets the device.Take care that if an external reset chip is used, the reset pulse in output may be wrong and in this case the reset sequence is not correctly executed.
• Start the application without reset A jump at the address 0000h is used to start the application without reset.

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 AT89C 51SND1 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.