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AT89C51SND1 Dataheets PDF



Part Number AT89C51SND1
Manufacturers ATMEL Corporation
Logo ATMEL Corporation
Description MP3 Microcontrollers
Datasheet AT89C51SND1 DatasheetAT89C51SND1 Datasheet (PDF)

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 MP3 Microcontrollers Description This.

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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 MP3 Microcontrollers 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. AT89C51SND1 UART Bootloader Bootloader Revision Revision 1.0.0 Revision 1.1.0 Purpose of Modifications New release increasing programming speed Bug fix in boot process Date June 2002 October 2002 4241B–MP3–07/04 1 Functional Description In-System Programming Capability The AT89C51SND1 bootloader facilitates In-System Programming and In-Application Programming. In-System Programming (ISP) allows the user to program or reprogram a microcontroller’s on-chip Flash memory without removing it from the system and without the need of a pre-programmed application. The UART bootloader can manage a communication with a host through the serial network. It can also access and perform requested operations on the on-chip Flash memory. In-Application Programming or SelfProgramming Capability In-Application Programming (IAP) allows the reprogramming of a microcontroller’s onchip Flash memory without removing it from the system and while the embedded application is running. The UART bootloader contains some Application Programming Interface routines named API routines allowing IAP by using the user’s firmware. Block Diagram This section describes the different parts of the bootloader. Figure 1 shows the on-chip bootloader and IAP processes. Figure 1. Bootloader Process Description External Host via the UART Protocol Communication On-chip User Application ISP Communication Management IAP User Call Management Flash memory Management Flash Memory 2 AT89C51SND1 UART Bootloader 4241B–MP3–07/04 AT89C51SND1 UART Bootloader ISP Communication Management The purpose of this process is to manage the communication and its protocol between the on-chip bootloader and an external device (host). The on-chip bootloader implements a serial protocol (see Section “Protocol”, page 9). This process translates serial communication frames (UART) into Flash memory accesses (read, write, erase, etc.). Several Application Program Interface (API) calls are available to the application program to selectively erase and program Flash pages. All.


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