AT91SAM9XE128_1 Datasheet, PDF (427/866 Pages) ATMEL Corporation – AT91 ARM Thumb Microcontrollers

AT91SAM9XE128/256/512 Preliminary
32.4 Signal Description
Table 32-1. Signal Description
Pin Name
MISO
MOSI
SPCK
NPCS1-NPCS3
NPCS0/NSS
Pin Description
Master In Slave Out
Master Out Slave In
Serial Clock
Peripheral Chip Selects
Peripheral Chip Select/Slave Select
Master
Input
Output
Output
Output
Output
Type
Slave
Output
Input
Input
Unused
Input
32.5 Product Dependencies
32.5.1 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.
32.5.2
Power Management
The SPI may be clocked through the Power Management Controller (PMC), thus the program-
mer must first configure the PMC to enable the SPI clock.
32.5.3 Interrupt
The SPI interface has an interrupt line connected to the Advanced Interrupt Controller (AIC).
Handling the SPI interrupt requires programming the AIC before configuring the SPI.
6254B–ATARM–29-Apr-09
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