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The On-board Software
3. Check JP1 is in STD position. Power-on or press RESET, holding down the SW3
button simultaneously. Wait for all LEDs to light up together and then release
SW3. LED3 remains lit. If the AT91Loader is configured in automatic mode, the
download starts. Wait for the download to end.
4. Put JP1 in USER position and press RESET button. The application downloaded
starts.
For further details, see the application note “Crystal Oscillator and PLL Considerations
for AT91M42800A and AT91M55800A”, literature number 1740A. A PLL Filter Calcula-
tor Tool is also available. See “Automatic_calculation_xls.zip”.
3.5
3.6
3.7
Power-down
Demonstration
Angel Debug
Monitor
Programmed
Default Speed
The AT91EB42 Evaluation Board is delivered with a battery unit to supply the board
when the main power supply is removed. The aim of the power-down demonstration is
to save the battery unit. When the power-down function is started, the main clock of the
AT91M42800A is switched to the slow clock oscillator at 32.768 kHz. The processor is
put in IDLE mode and all peripheral clocks are turned off. The power-down mode is indi-
cated by LED4 flashing every 10 seconds. The boot starts the power-down
demonstration if the SW4 button is pressed at reset.
The procedure is as follows:
1. Power-on or press RESET, holding down the SW4 button simultaneously.
2. Wait for all LEDs to light up and then release SW4. LED4 remains lit for
3 seconds and light off. Then LED4 flashes every 10 seconds.
3. Press SW4 or the reset button to re-start the board. When SW4 is pressed,
the power-down demonstration re-configures the AT91M42800A to run at
32.768 MHz and branches to Angel.
The Angel Debug Monitor is located in the Flash from 0x01006000 up to 0x01011FFF.
The boot program starts it if no button is pressed at reset.
When Angel starts, it recopies itself in SRAM in order to run faster. The SRAM used by
Angel is from 0x02020000 to 0x0203FFFF, i.e., the highest half part of the SRAM.
The Angel on the AT91EB42 Evaluation Board can be upgraded regardless of the ver-
sion programmed on it.
Note that if the debugger is started through ICE while the Angel monitor is on, the
Advanced Interrupt Controller (AIC) and the USART channel are enabled.
As the speed of the AT91M42800A is programmable, the Boot Software Program initial-
izes the device to run as fast as possible, i.e., at 32.768 MHz. The Boot Software
Program and the Functional Test Software are run at this speed. When Angel is started,
it also runs at 32.786 MHz and the user should not modify this frequency without repro-
gramming the speed of the USARTs.
AT91EB42 Evaluation Board User Guide
3-3
1708C–ATARM–12-May-05
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