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Modifications reserved | Data subject to change without notice

Document number: BST-BMA456-DS000-08

Revision_3.5_032025

FIFO Interrupts

The FIFO supports two interrupts, a FIFO full interrupt and a watermark interrupt:

•

The FIFO full interrupt is issued when the FIFO fill level is above the full threshold. The full

threshold is reached just before the last two frames are stored in the FIFO.

•

The FIFO watermark is issued when the FIFO fill level is equal or above a watermark defined in

In order to enable/use the FIFO full or watermark interrupts map them on the desired interrupt pin via

INT_MAP_DATA.

Both interrupts are suppressed when a read operation on the Register FIFO_DATA is ongoing.

Latched FIFO interrupts will only get cleared, if the status register gets read and the fill level is below

the corresponding FIFO interrupt (full or watermark).

FIFO Flush

The user can trigger a FIFO reset by writing the command fifo_flash (0xB0) in CMD.

Automatic resets are only performed in the following cases:

•

A sensor is enabled or disabled in headerless mode

•

A transition between headerless and headermode or vice versa has occurred.

•

Size of auxiliary sensor data in a frame changed in header or headerless mode

BMA456 Datasheet(PDF) 29 Page - Bosch Sensortec GmbH