at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 234

• Manufacturer Part Number: at91rm3400
• Description: Atmel Advanced At91 Arm Microcontroller
• Manufacturer: ATMEL Corporation

Mode Fault Detection
A mode fault is detected when the SPI is programmed in Master Mode and a low level is
driven by an external master on the NPCS0/NSS signal.
When a mode fault is detected, the MODF bit in the SPI_SR is set until the SPI_SR is read
and the SPI is disabled until re-enabled by bit SPIEN in the SPI_CR (Control Register).
By default, Mode Fault Detection is enabled. It is disabled by setting the MODFDIS bit in the
SPI Mode Register.
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