4.2
JTAG/ICE
Table 4-2. JTAG/ICE Configuration
4.3
Designation
S1
S2
S3
R13
R14
Microcontroller Clock
Default Setting
Opened
Opened
Opened
Soldered
Soldered
Feature
Disables the ICE NTRST input
Selects ICE mode or JTAG mode
Disables TCK <-> RTCK local loop. If S3 is closed, R13 must be
unsoldered.
Enables the ICE RTCK return. S3 must be opened
Enables the ICE NRST input
Table 4-3. Microcontroller Clock Configuration
4.4
Designation
R18/R20
S4
J9
Memory Configuration
Default Setting
Soldered
Opened
Feature
Enables the use of 18.432MHz crystal. If an external clock is used,
R18/R20 must be unsoldered and S4 closed.
Slow Clock Setting. See Table 4-1 .
Table 4-4. Memory Configuration
Designation
SDRAM
R31
R32
NAND Flash (MN6x)
R34
S6
Default Setting
Soldered
Soldered
Soldered
Opened
Feature
Enables MN7 Chip select access
Enables MN8 Chip select access
Enables the use of Ready Busy signal
Disables write protection.
SERIAL DATAFLASH (MN9)
S5
Opened
Disables the write protection.
TWI SERIAL EEPROM (MN10)
4-2
6311A–ATARM–04-Feb-08
R46
R47
Soldered
Soldered
Enables SCL access
Enables SDA access
AT91SAM9XE-EK Evaluation Board User Guide
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