Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
619
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
36.6
Product Dependencies
36.6.1 I/O
Lines
The pins used for interfacing the compliant external devices may be multiplexed with PIO lines. The programmer must
first program the PIO controllers to assign the SPI pins to their peripheral functions.
first program the PIO controllers to assign the SPI pins to their peripheral functions.
36.6.2 Power
Management
The SPI may be clocked through the Power Management Controller (PMC), thus the programmer must first configure the
PMC to enable the SPI clock.
PMC to enable the SPI clock.
36.6.3 Interrupt
The SPI interface has an interrupt line connected to the Interrupt Controller. Handling the SPI interrupt requires
programming the interrupt controller before configuring the SPI.
programming the interrupt controller before configuring the SPI.
36.6.4 Direct Memory Access Controller (DMAC)
The SPI interface can be used in conjunction with the DMAC in order to reduce processor overhead. For a full description
of the DMAC, refer to the corresponding section in the full datasheet.
of the DMAC, refer to the corresponding section in the full datasheet.
Table 36-2. I/O Lines
Instance
Signal
I/O Line
Peripheral
SPI0
SPI0_MISO
PA11
A
SPI0
SPI0_MOSI
PA12
A
SPI0
SPI0_NPCS0
PA14
A
SPI0
SPI0_NPCS1
PA7
B
SPI0
SPI0_NPCS2
PA1
B
SPI0
SPI0_NPCS3
PB3
B
SPI0
SPI0_SPCK
PA13
A
SPI1
SPI1_MISO
PA21
B
SPI1
SPI1_MOSI
PA22
B
SPI1
SPI1_NPCS0
PA8
B
SPI1
SPI1_NPCS1
PA0
B
SPI1
SPI1_NPCS2
PA31
B
SPI1
SPI1_NPCS3
PA30
B
SPI1
SPI1_SPCK
PA23
B
Table 36-3. Peripheral IDs
Instance
ID
SPI0
13
SPI1
14