UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1028 of 1269
NXP Semiconductors
UM10503
Chapter 40: LPC43xx SPI
Register has been read when the SPIF status is active. If the SPI Data Register is written
in this time frame, the write data will be lost, and the write collision (WCOL) bit in the SPI
Status Register will be activated.
Mode Fault
If the SSEL signal goes active when the SPI block is a master, this indicates another
master has selected the device to be a slave. This condition is known as a mode fault.
When a mode fault is detected, the mode fault (MODF) bit in the SPI Status Register will
be activated, the SPI signal drivers will be de-activated, and the SPI mode will be changed
to be a slave.
If the SSEL function is assigned to its related pin in the relevant Pin Function Select
Register, the SSEL signal must always be inactive when the SPI controller is a master.
Slave Abort
A slave transfer is considered to be aborted if the SSEL signal goes inactive before the
transfer is complete. In the event of a slave abort, the transmit and receive data for the
transfer that was in progress are lost, and the slave abort (ABRT) bit in the SPI Status
Register will be activated.