Atmel AT91EB55, Руководство пользователя

Страница: 21 / 41

Appendix A – Configuration Straps
AT91EB55 Evaluation Board User Guide 5-3
1709C–ATARM–28-Apr-05
CB13, CB14 I
2
C EEPROM Enabling
Closed
(1)
E
2
PROM communication is enabled.
Open E
2
PROM 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 V
DDCORE
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 V
DDCORE
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 AT49BV162A is fitted on the board.
Closed Should not be closed when an AT49BV162A 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.
JP2 Push Button Enabling
Open SW1-4 inputs to the AT91 are valid.
Closed SW1-4 inputs to the AT91 are not valid. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.