FXOS8700CQ datasheet(27/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

Registers by Functional Blocks

9.1

Device configuration

9.1.1

STATUS (0x00) register

The STATUS register aliases allow for the contiguous burst read of both status and current acceleration sample/FIFO data using

the auto incrementing mechanism in both 8 and 14-bit modes.

9.1.2

DR_STATUS (0x00) register

Data-Ready Status when STATUS = 0x00

This STATUS register provides the acquisition status information on a per-sample basis, and reflects real-time updates to the

OUTX, OUTY, and OUTZ registers.

When the FIFO subsystem data output register driver is disabled (F_SETUP[f_mode] = 0b00), this register indicates the real-

time status information of the X, Y, and Z sample data.

DR_STATUS or F_STATUS

00000000

Figure 10. STATUS register

Table 15. STATUS Description

Field

Description

F_SETUP[f_mode] = 0b00

→ DR_STATUS

F_SETUP[f_mode] > 0b00

→ F_STATUS

zyxow

zow

yor

xor

zyxdr

zdr

ydr

xdr

00000000

Figure 11. DR_STATUS register

Table 16. DR_STATUS description

Field

Description

zyxow

zyxow is set to 1 whenever new data is acquired before completing the retrieval of the previous set. This event occurs when

the content of at least one acceleration data register (i.e. OUTX, OUTY, and OUTZ) has been overwritten. zyxow is cleared

when the high-bytes of the acceleration data (OUTX_MSB, OUTY_MSB, and OUTZ_MSB) are read.

X, Y, Z-axis data overwrite.

0: No data overwrite has occurred

1: Previous X, Y, Z data was overwritten by new X, Y, Z data before it was completely read

zow

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

previous data is overwritten. zow is cleared anytime OUTZ_MSB register is read.

Z-axis data overwrite.

0: No data overwrite has occurred

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

yow

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

previous data is overwritten. yow is cleared anytime OUTY_MSB register is read.

Y-axis data overwrite.

0: No data overwrite has occurred

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

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