AT89C5131A View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A

USB Microcontrollers

Atmel Corporation 

Functional

Description

The AT89C5131A bootloader facilitates In-System Programming and In-Application

Programming.

In-System

Programming

Capability (IAP)

In-System Programming allows the user to program or reprogram a microcontroller on-chip

Flash memory without removing it from the system and without the need of a pre-programmed

application.

The USB bootloader can manage a communication with a host through the USB bus. It can also

access and perform requested operations on the on-chip Flash memory.

In-Application

Programming or

Self Programming

Capability (ISP)

In-Application Programming (IAP) allows the reprogramming of a microcontroller on-chip Flash

memory without removing it from the system and while the embedded application is running.

The USB bootloader contains some Application Programming Interface routines named API rou-

tines that allow IAP by using the user’s firmware.

Block Diagram

This section describes the different parts of the bootloader. Figure 1 shows the on-chip boot-

loader and IAP processes.

Figure 1. Bootloader Process Description

External Host Via the

USB Protocol

Communication

On-chip

User

Application

ISP Communication

Management

IAP

User Call

Management

Flash Memory

Management

Flash

Memory

2 AT89C5131A USB Bootloader

4287E–USB–04/08

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