MMA8451Q_12 datasheet(21/52 Pages) FREESCALE

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MMA8451Q

Sensors

Freescale Semiconductor, Inc.

ZYXOW is set whenever a new acceleration data is produced before completing the retrieval of the previous set. This event

occurs when the content of at least one acceleration data register (i.e., OUT_X, OUT_Y, OUT_Z) has been overwritten. ZYXOW

is cleared when the high-bytes of the acceleration data (OUT_X_MSB, OUT_Y_MSB, OUT_Z_MSB) of all the active channels are

read.

ZOW is set whenever a new acceleration sample related to the Z-axis is generated before the retrieval of the previous sample.

When this occurs the previous sample is overwritten. ZOW is cleared anytime OUT_Z_MSB register is read.

YOW is set whenever a new acceleration sample related to the Y-axis is generated before the retrieval of the previous sample.

When this occurs the previous sample is overwritten. YOW is cleared anytime OUT_Y_MSB register is read.

XOW is set whenever a new acceleration sample related to the X-axis is generated before the retrieval of the previous sample.

When this occurs the previous sample is overwritten. XOW is cleared anytime OUT_X_MSB register is read.

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

acceleration data (OUT_X_MSB, OUT_Y_MSB, OUT_Z_MSB) of all the enabled channels are read.

ZDR is set whenever a new acceleration sample related to the Z-axis is generated. ZDR is cleared anytime OUT_Z_MSB register

is read.

YDR is set whenever a new acceleration sample related to the Y-axis is generated. YDR is cleared anytime OUT_Y_MSB register

is read.

XDR is set whenever a new acceleration sample related to the X-axis is generated. XDR is cleared anytime OUT_X_MSB register

is read.

Table 13. STATUS Description

ZYXOW

X, Y, Z-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

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

ZOW

Z-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

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

YOW

Y-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

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

XOW

X-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

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

ZYXDR

X, Y, Z-axis new Data Ready. Default value: 0

0: No new set of data ready

1: A new set of data is ready

ZDR

Z-axis new Data Available. Default value: 0

0: No new Z-axis data is ready

1: A new Z-axis data is ready

YDR

Y-axis new Data Available. Default value: 0

0: No new Y-axis data ready

1: A new Y-axis data is ready

XDR

X-axis new Data Available. Default value: 0

0: No new X-axis data ready

1: A new X-axis data is ready

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