Jumpers
4.3
Microcontroller Clock
Table 4-3. Microcontroller Clock Configuration
Default
4.4
Memory
Designation
S2
Setting
Opened
Feature
To use an external source clock, the user has to close
S2 and populate J7. In this case, C16, C17 and J7 have
to be unsoldered.
Table 4-4. Memory Configuration
Default
Designation
SDRAM (MN5 & MN6)
R29
R30
NANDFLASH (MN7)
J12
R32
S3
Setting
Soldered
Soldered
Closed
Soldered
Opened
Feature
Enables MN5 Chip select access
Enables MN6 Chip select access
Enables the use of the NANDFLASH device
Enables the use of the Ready/Busy signal
Disables the write protect
SERIAL DATAFLASH (MN8)
J13
S4
Closed
Opened
Enables the use of the DATAFLASH device
Disables the write protect.
TWI SERIAL EEPROM NOT POPULATED (MN9)
4.5
Miscellaneous
Refer to the TOP level schematic for the PIO usage.
Table 4-5. Miscellaneous
Default
Designation
Setting
Feature
USB HIGH SPEED DEVICE INTERFACE
R75
DBGU COM PORT
R64
R66
Soldered
Soldered
Soldered
USB DEVICE: Enables the use of the USBCNX signal
Enables the use of DTXD output signal
Enables the use of DRXD input
RS232 COM PORT : Enable the use of Input/output signals
4-2
6325C–ATARM–22-Jul-10
AT91SAM9RL-EK Evaluation Board User Guide
相关PDF资料
AT91SAM9X35-EK KIT EVAL FOR AT91SAM9X35
AT91SAM9XE-EK KIT EVAL FOR AT91SAM9XE
AT93C46D-TH-T IC EEPROM 1KBIT 2MHZ 8TSSOP
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