Appendix A – Configuration Straps
AT91EB42 Evaluation Board User Guide
5-3
CB15
Serial DataFlash Enabling
Closed
(1)
AT91 NPCSA0 select signal is connected to the serial DataFlash memory.
Open
AT91 NPCSA0 select signal is not connected to the serial DataFlash
memory. This authorizes users to connect the corresponding PIO to their
own resources via the I/O expansion connector.
CB17
SPI EEPROM Enabling
Closed
(1)
EEPROM communication enabled
Open
EEPROM communication disabled. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.
CB18
PB20 ADC Write Access Signal
Closed
(1)
AT91 PB20 signal is used to control the RD/WR ADC (U20) input pin. Prior to
a write access, position this PIO line in a low state. Position it in a high state
prior to a read access.
Open
AT91 PB20 signal is not used to control the RD/WR ADC (U20) input pin.
This authorizes users to connect the corresponding signal to their own
resources via the I/O expansion connector.
CB19
PB18 End of Fast Charge Signal
Closed
(1)
AT91 PB18 signal is connected to the battery charger (U16), NFASTCHG
output pin.
Open
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.
CB20
JTAGSEL
1-2
(1)
AT91 standard ICE debug feature enabled
2-3
IEEE 1149.1 JTAG boundary scan feature enabled
CB21, CB22, CB23
Charger Device (U16): Programming the Battery Number of Cells
Number of Cells
CB21
CB22
CB23
1
Open
Closed
Closed
2
Open
Open
Closed
4
Closed
Open
Closed
5
(1)
Open
Closed
Open
6
Open
Open
Open
8
Closed
Open
Open
