AT91EB55 datasheet(17/37 Pages) ATMEL

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Appendix A – Configuration Straps

AT91EB55 Evaluation Board User Guide

5-3

CB13, CB14

2C EEPROM Enabling

Closed

(1)

2PROM communication is enabled.

Open

2PROM communication is disabled. This authorizes users to connect the

corresponding PIO to their own resources via the I/O expansion connector.

CB15

JTAGSEL

1 – 2

(1)

The MCU standard ICE debug feature is enabled.

2 – 3

IEEE 1149.1 JTAG boundary scan feature is enabled.

CB16

R(eturn) TCK ICE Signal Synchronization

1 – 2

The TCK signal from the JTAG interface can be synchronized with MCKO

signal and returns to the JTAG interface. (RTCK)

2 – 3

(1)

The TCK and RTCK ICE signals are not synchronized with MCKO.

CB17

VDDCORE Voltage Measurement

Closed

(1)

The V

DDCORE power supply is connected to the ADC Channel 2 (AD2) input

through a resistor bridge (divisor ratio 1/2).

Open

The VDDCORE power supply is not connected to the ADC Channel 2 (AD2) input.

This authorizes users to connect the corresponding ADC Channel to their own

resources via the I/O expansion connector.

CB18

Flash Configuration

Open

Should be open when an AT49BV1614 is fitted on the board.

Closed

Should be closed when an AT49BV1604 is fitted on the board.

JP1

User or Standard Boot Selection

2 – 3

The first half of the Flash memory is accessible at its base address.

1 – 2

The second half of the Flash memory is accessible at its base address. This

authorizes users to download their own application software in this part and to

boot on it.

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