FXOS8700CQ datasheet(28/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

9.1.3

F_STATUS (0x00) register

FIFO Status when STATUS > 0x00.

If the FIFO subsystem data output register driver is enabled, the status register indicates the current status information of the

FIFO subsystem.

The f_ovf and f_wmrk_flag flags remain asserted while the event source is still active, but the user can clear the FIFO interrupt

bit flag in the interrupt source register (INT_SOURCE) by reading the F_STATUS register. In this case, the

INT_SOURCE[src_fifo] bit will be set again when the next data sample enters the FIFO.

Therefore the f_ovf bit flag will remain asserted while the FIFO has overflowed and the f_wmrk_flag bit flag will remain asserted

while the f_cnt value is equal to or greater than then f_wmrk value.

xow

xow is set to 1 whenever a new X-axis acquisition is completed before the retrieval of the previous data. When this occurs the

previous data is overwritten. xow is cleared anytime OUTX_MSB register is read.

X-axis data overwrite.

0: No data overwrite has occurred

1: Previous X-axis data was overwritten by new X-axis data before it was read

zyxdr

zyxdr signals that a new acquisition for any of the enabled channels is available. zyxdr is cleared when the high-bytes of the

acceleration data (OUTX_MSB, OUTY_MSB, OUTZ_MSB) are read.

X, Y, Z-axis new data ready.

0: No new set of data ready

1: New set of data is ready

zdr

zdr is set to 1 whenever a new Z-axis data acquisition is completed. zdr is cleared anytime the OUTZ_MSB register is read.

Z-axis new data available.

0: No new Z-axis data is ready

1: New Z-axis data is ready

ydr

ydr is set to 1 whenever a new Y-axis data acquisition is completed. ydr is cleared anytime the OUTY_MSB register is read.

Y-axis new data available. Default value: 0

0: No new Y-axis data ready

1: New Y-axis data is ready

xdr

xdr is set to 1 whenever a new X-axis data acquisition is completed. xdr is cleared anytime the OUTX_MSB register is read.

X-axis new data available. Default value: 0

0: No new X-axis data ready

1: New X-axis data is ready

f_ovf

f_wmrk_flag

f_cnt[5:0]

Figure 12. F_STATUS register

Table 17. FIFO flag event descriptions

f_ovf

f_wmrk_flag

Event description

No FIFO overflow events detected.

FIFO overflow event detected.

No FIFO watermark event detected.

A FIFO Watermark event was detected indicating that a FIFO sample count greater than watermark

value has been reached.

If F_SETUP[f_mode] = 0b11, a FIFO trigger event was detected

Table 16. DR_STATUS description

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