Board Strap and Switch Configuration
AT91CAP9-STK Starter Kit User Guide
3-3
6351B–CAP–27-Jun-08
3.3
Switches
Table 3-3. Switches
Name
Position
(default)
Descriptions
1-2
1-3
S1
1-3
VIN_AT73C239 power supply is VIN_SURV_AT73C239
power supply.
VIN_AT73C239 power supply is 5V if J5 is connected.
Not connected by default for AT73C239 (connected for
AT73C237 mounting).
S2
1-3
VIN_SURV_AT73C239 power supply is 3V3 power
supply.
VIN_SURV_AT73C239 power supply is VBACKUP (J6
connector not mounted, VBACKUP strap on S2 pin 3).
S7
1-2
AT73C239 TWCK signal is pull -up to
VIN_SURV_AT73C239 and controlled by CAP9 PA7
PIO (allows hibernate mode).
AT73C239 TWCK signal is CAP9 I2C bus TWCK signal.
S8
1-2
AT73C239 TWCK signal is VIN_SURV_AT73C239
power supply.
AT73C239 TWD signal is CAP9 I2C bus TWD signal.
S9
1-2
AT73C239 V
BAT
power supply is V
BACKUP
.
AT73C239 V
BAT
power supply is VIN_AT73C239 power
supply.