AT91EB55 datasheet(9/37 Pages) ATMEL

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AT91EB55 Evaluation Board User Guide

3-1

Section 3

The On-board Software

3.1

AT91EB55

Evaluation Board

The AT91EB55 Evaluation Board contains an AT49BV16X4 Flash device programmed

with default software. Only the lowest eight 8-Kbyte sectors are used. The remaining

sectors are user-definable and can be programmed using one of the Flash downloader

solutions offered in the AT91 library.

When delivered, the Flash device contains:

The Boot Software Program

The Functional Test Software

The SRAM Downloader

The Angel Debug Monitor

A Default User Boot with a Default Application

The boot, FTS and SRAM downloader are in sectors 0 and 1 of the Flash. These sec-

tors are not locked for an easy on-board upgrade. The user must avoid overwriting this

sector.

3.2

The Boot

Software

Program

The Boot Software Program configures the AT91M55800A and thus controls the mem-

ory and other board devices.

The Boot Software Program is started at reset if JP1 is in the STD position. If JP1 is in

the USER position, the AT91M55800A boots from address 0x01010000 in the Flash,

which must have a user-defined boot.

The Boot Software Program first initializes the master clock frequency at 32 MHz, the

EBI, then executes the REMAP and checks the state of the buttons as described below.

As long as the SW1 button is pressed:

All the LEDs light together

The D1 LED remains lit until SW1 is released

The Functional Test Software (FTS) is started

As long as the SW2 button is pressed:

All the LEDs light together

The D2 LED remains lit until SW2 is released

The SRAM downloader is activated

When the SW4 button is pressed:

The shutdown function from AT91M55800A is activated. The power-up can be

achieved by pressing the S1 push button only (Wake-up function)

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