FXOS8700CQ datasheet(64/86 Pages) FREESCALE

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Freescale Semiconductor, Inc.

9.14

Magnetometer data registers

9.14.1

M_DR_STATUS (0x32) register

Magnetic data ready status register.

This register indicates the real-time status information of the X, Y, and Z magnetic sample data.

Table 86. OFF_Z bit description

Field

Description

off_z[7:0]

Z-axis offset correction value expressed as an 8-bit 2's complement number.

xyzow

zow

yow

xow

xyzdr

zdr

ydr

xdr

00000

Figure 81. M_DR_STATUS register

Table 87. M_DR_STATUS bit descriptions

Field

Description

zyxow

zyxow is set to one whenever new magnetic data is acquired before completing the retrieval of the previous data set. This

event occurs when the content of at least one magnetometer output data register (i.e. M_OUT_X/Y/Z) has been overwritten.

zyxow is cleared when the most significant bytes of the magnetometer data (M_OUT_X_MSB, M_OUT_Y_MSB, and

M_OUT_Z_MSB) are read.

X, Y, Z-axis data overwrite:

0: No data overwrite has occurred

1: Previous X, Y, Z magnetic 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 the M_OUT_Z_MSB register is read.

Z-axis data overwrite:

0: No data overwrite has occurred

1: Previous Z-axis magnetic 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 M_OUT_Y_MSB register is read.

Y-axis data overwrite:

0: No data overwrite has occurred

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

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 the M_OUT_X_MSB register is read.

X-axis data overwrite:

0: No data overwrite has occurred

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

zyxdr

zyxdr signals that a new acquisition for the X, Y, and Z axes magnetic data is available. zyxdr is cleared when the most

significant bytes of the magnetometer data (M_OUT_X_MSB, M_OUT_Y_MSB, and M_OUT_Z_MSB) are read.

X, Y, Z new data available:

0: No new set of X, Y, Z magnetic data is available

1: A new set of X, Y, Z magnetic data is available

zdr

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

read. Z-axis new data available:

0: No new Z-axis magnetic data is available

1: New Z-axis magnetic data is available

ydr

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

read. Y-axis new data available:

0: No new Y-axis magnetic data is available

1: New Y-axis magnetic data is available

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