User manual

Evaluation Kit Hardware
SAM4S-EK2 User Guide 4-20
11176A–ATARM–24-Sep-12
4.4.3 Test Points
Some test points have been placed on the SAM4S-EK2 board for the verification of important signals.
4.4.4 Assigned PIO Lines, Disconnection Possibility
As pointed out in some previous interface description, 0 Ohm resistors have been inserted on the path of
the receiver PIO lines of the SAM4S-EK2. These are the PIO lines connected to an external driver on the
board. The 0 Ohm resistors allow disconnecting each of these for custom usage (through PIO expansion
connectors for example). This feature gives the user an added level of versatility for prototyping a system
of his own. See the table below.
Table 4-5. Audio Input Configuration
JP17 JP19 MONO-STEREO INPUT
OFF OFF PIN test point (TP12)
OFF ON Left-in only
ON OFF Right-in only
ON ON Sum of Left-in and Right-in
Table 4-6. Test Points
Reference Function
TP1, TP2, TP3, TP4 GND
TP5
TP6
UART TXD
UART RXD
TP7
TP8, TP9
LCD Backlight driver anode
Aux ADC input for TSC
TP12 Optional Audio PA input
Table 4-7. 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_485
R26 0R PA25
R27 0R PA24
R28 0R PA22
R31 0R PA23
R33 0R PA22
R34 0R PA21_232
R35 0R PA24
R36 0R PA25
R44 0R NRST