TMC4330A Datasheet | Document Revision 1.01 • 2017-JAN-12
22/166
SPI Status Bit Transfer
Up to eight events can be selected for permanent SPI status report. Consequently, these events
are always transferred at the most significant transfer bits within each
TMC4330A SPI response.
Assign an Event
to a Status Bit
In order to select an event for the SPI status bits, assign the
SPI_STATUS_SELECTION register 0x0B according to the particular event in
the EVENTS register:
Action:
Set the related SPI_STATUS_SELECTION register bit position to 1.
Result:
The related event is transferred with every SPI datagram response as SPI_STATUS.
NOTE:
The bit positions are sorted according to the event bit positions in the EVENTS
register 0x0E. In case more than eight events are selected, the first eight bits
(starting from index 0 = LSB) are forwarded as SPI_STATUS.
Generation of Interrupts
Similar to EVENT_CLEAR_CONF register and SPI_STATUS_SELECTION register, events can be
selected for forwarding via INTR output. The selected events are ORed to one signal which
means that INTR output switches active as soon as one of the selected events triggers.
Generate
Interrupts
In order to select an event for the INTR output pin, assign the INTR_CONF
register 0x0D according to the particular event in the EVENTS register:
Action:
Set the related INTR_CONF register bit position to 1.
Result:
The related event is forwarded at the INTR output. If more than one event is
requested, INTR becomes active as soon as one of the selected events is active.
INTR Output
Polarity
Per default, the INTR output is low active.
In order to change the INTR polarity to high active, do the following:
Action:
Set intr_pol =1 (GENERAL_CONF register 0x00).
Result:
INTR is high active.
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