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I2C Registers
Table 21-16. I2C_WE Register Field Descriptions (continued)
Bit Field Type Reset Description
1 NACK_WE R/W 0h No acknowledgment IRQ wakeup enable.
This read/write bit is used to enable or disable wakeup signal
generation when I2C module is involved into a long transfer and no
more registers accesses are performed on the interface (for example
the module is set in F/S I2C master transmitter mode and FIFO is
full).
If in the middle of such of a transaction a Not Acknowledgment event
is raised, the module needs to inform CPU about transmission error.
0x0 = Not Acknowledge wakeup disabled
0x1 = Not Acknowledge wakeup enabled
0 AL_WE R/W 0h Arbitration lost IRQ wakeup enable.
This read/write bit is used to enable or disable wakeup signal
generation when I2C module is configured as a master and it loses
the arbitration.
This wake up is very useful when the module is configured as a
master transmitter, all the necessary data is provided in the FIFO Tx,
STT is enabled and the module enters in Idle Mode.
If the module loses the arbitration, an Arbitration Lost event is raised
and the module needs to inform CPU about transmission error.
Note: The AL wakeup must be enabled only for multimaster
communication.
If the AL_WE is not enabled and the scenario described above
occurs, the module will not be able to inform the CPU about the state
of the transfer and it will be blocked in an undetermined state.
0x0 = Arbitration lost wakeup disabled
0x1 = Arbitration lost wakeup enabled
3735
SPRUH73H–October 2011–Revised April 2013 I2C
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