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Appendix A – Configuration Straps
CB17
SPI EEPROM Enabling
Closed
Open
(1)
EEPROM communication enabled.
EEPROM communication disabled. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.
Note:
CB18
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
R(eturn) TCK ICE Signal Synchronization
1-2
2-3
Note:
(1)
The TCK and RTCK ICE signals are not synchronized with MCKO.
The TCK signal from the JTAG interface can be synchronized with the MCKO
signal and returns to the JTAG interface (RTCK).
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB19
Closed (1)
Open
PB18 End of Fast Charge Signal
AT91 PB18 signal is connected to the battery charger (U16), NFASTCHG
output pin.
AT91 PB18 signal is not connected to the battery charger (U16), NFASTCHG
output pin. This authorizes users to connect the corresponding signal to their
own resources via the I/O expansion connector.
Note:
CB20
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
JTAGSEL
1-2
2-3
Note:
(1)
AT91 standard ICE debug feature enabled
IEEE 1149.1 JTAG boundary scan feature enabled
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB21, CB22, CB23
Charger Device (U16): Programming the Battery Number of Cells
Number of Cells
1
2
4
5 (1)
6
8
AT91EB42 Evaluation Board User Guide
CB21
Open
Open
Closed
Open
Open
Closed
CB22
Closed
Open
Open
Closed
Open
Open
CB23
Closed
Closed
Closed
Open
Open
Open
5-5
1708C–ATARM–12-May-05
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