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Section 3
The On-board Software
3.1
AT91EB42
The AT91EB42 Evaluation Board embeds an AT49BV162A Flash memory device pro-
Evaluation Board grammed with default software. Only the lowest 8 x 8 KB sectors are used. The
remaining sectors are user definable, and can be programmed using one of the Flash
downloader “Flash_16x4” solutions offered in the AT91 Library.
When delivered, the Flash memory device contains:
! the Boot Software Program
! the Functional Test Software (FTS)
! the Flash Uploader
! the power-down function
! the Angel Debug Monitor
! a default user boot with a default application (LED Swing Application)
The Boot Software Program and Functional Test Software (FTS) are in sectors 0 and 1
of the Flash. These sectors are not locked in order to provide an easy on-board
upgrade. The user must avoid overwriting these sectors.
3.2
Boot Software
Program
The Boot Software Program configures the AT91M42800A, and thus controls the mem-
ory and other board components.
The Boot Software Program is started at reset if JP1 is in the STD position. If JP1 is in
the USER position, the AT91M42800A boots from address 0x01100000 in the Flash,
which must have a user-defined boot.
The Boot Software Program first initializes the master clock frequency at 32.768 MHz.
The EBI then executes the REMAP procedure and checks the state of the buttons as
described below.
! When the SW1 button is pressed:
– All the LEDs light up together.
– The D1 LED remains lit when SW1 is released.
– The Functional Test Software (FTS) is started.
AT91EB42 Evaluation Board User Guide
3-1
Rev. 1708C–ATARM–12-May-05
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