Evaluation Kit Hardware
SAM4S-EK Development Board User Guide
4-21
11139A–ATARM–29-Nov-11
Table 4-8.
Disconnecting Possibility
Designation
Default Assignment
PIO
R19
0R
PC18, RDY/BSY on NAND Flash
R20
0R
PA29
R22
DNP
Optional write protection on NAND Flash
R25
0R
PA21
R26
0R
PA25
R27
0R
PA24
R28
0R
PA22
R31
0R
PA23
R33
0R
PA22
R34
0R
PA21
R35
0R
PA24
R36
0R
PA25
R44
0R
NRST
R47
0R
PA9
R48
0R
R2OUT/MN5
R59
0R
LCD backlight LED anode
R66
0R
PA11
R67
0R
PA5
R68
0R
PC13
R69
0R
PA4
R70
0R
Vref TSC
R118
0R
PA3 ZB_RSTN
R119
0R
PA5 IRQ1_ZBEE
R120
0R
PA4 IRQ0_ZBEE
R121
0R
PA6 SLP_TR
Table 4-9.
Default Not Populated Parts
Reference
Function
J1, R1
External clock resource input
Y1, R3, R7
Backup 12 MHz crystal
R6, R8
Isolation on 12 MHZ clock source and GPIO expansion
R9, R10
Isolation on 32 KHz clock source and GPIO expansion
R22
Optional write protection NAND Flash
R23
Optional pull-up for open drain output or equivalent device
R24, R30
Differential impedance matching for RS485 cable