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ATSAM4C-EK [USER GUIDE]
11251A–ATARM–16-Dec-13
3.14
PIO Usage
3.14.1 PIO Port A Pin Assignments
Table 3-8.
PIO Port A Pin Assignments
I/O Line
Peripheral
Extra
Function
System
Function
Reset State
Using
A
B
C
PA0
RTS3
PCK2
A10
COM0
WKUP5
PIO, I, PU, ST
LCD Com
PA1
CTS3
NCS1
A9
COM1
–
LCD Com
PA2
SCK3
NCS2
A8
COM2
–
LCD Com
PA3
RXD3
NCS3
A7
COM3
WKUP6
LCD Com
PA4
TXD3
–
A6
COM4/AD1
–
Analog input
PA5
SPI0_NPCS0
–
A5
COM5/AD2
–
SerFlash / NPCS
PA6
SPI0_MISO
–
A4
SEG0
–
ZigBee
PA7
SPI0_MOSI
–
A3
SEG1
–
ZigBee
PA8
SPI0_SPCK
–
A2
SEG2
–
ZigBee
PA9
RXD2
–
A1
SEG3
WKUP2
RS232/485
PA10
TXD2
–
A0/NBS0
SEG4
–
RS232/485
PA11
RXD1
–
A23
SEG5
WKUP9
ZigBee / IRQ0
PA12
TXD1
–
A22-NCLE
SEG6/AD0
–
ZigBee/IRQ1/IRTC
PA13
SCK2
TIOA0
A21-NALE
SEG7
–
Backlight On/off
PA14
RTS2
TIOB0
A20
SEG8
WKUP3
RS232/485
PA15
CTS2
TIOA4
A19
SEG9
–
RS232/485
PA16
SCK1
TIOB4
A18
SEG10
–
MuxLCD
PA17
RTS1
TCLK4
A17
SEG11
WKUP7
ZigBee / RST
PA18
CTS1
TIOA5
A16
SEG12
–
ZigBee / SLPTR
PA19
RTS0
TCLK5
A15
SEG13
WKUP4
PB ScrUp
PA20
CTS0
TIOB5
A14
SEG14
–
PB ScrDwn
PA21
SPI0_NPCS1
–
A13
SEG15
–
ZigBee / NPCS
PA22
SPI0_NPCS2
–
A12
SEG16
–
ZigBit / IRQ
PA23
SPI0_NPCS3
–
A11
SEG17
–
–
PA24
TWD0
–
A10
SEG18
WKUP1
TWI / ZigBit
PA25
TWCK0
–
A9
SEG19
–
TWI / ZigBit
PA26
CTS4
–
A8
SEG20
–
–
PA27
–
–
NCS0
SEG21
–
–
PA28
–
–
NRD SEG22
–
–
PA29
PCK1
–
NWAIT
SEG23
–
–
MCLK (ATSense)
PA30
PCK1
–
A15
–
XOUT
XOUT
–
PA31
PCK0
–
A14
–
XIN
XIN
–
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