MMA8653FC datasheet(35/56 Pages) FREESCALE

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MMA8653FC

Sensors

Freescale Semiconductor, Inc.

6.6.3

0x16: FF_MT_SRC, Freefall/Motion Source Status Register

This register keeps track of the acceleration event which is triggering (or has triggered, in case of ELE bit in FF_MT_CFG register

being set to 1) the event flag. In particular EA is set to a logic ‘1’ when the logical combination of acceleration events flags

specified in FF_MT_CFG register is true. This bit is used in combination with the values in INT_EN_FF_MT and

INT_CFG_FF_MT register bits to generate the freefall/motion interrupts.

An X,Y, or Z motion is true when the acceleration value of the X or Y or Z channel is higher than the preset threshold value defined

in the FF_MT_THS register.

Conversely an X, Y, and Z low event is true when the acceleration value of the X and Y and Z channel is lower than the preset

threshold value defined in the FF_MT_THS register.

Figure 33. 0x16: FF_MT_SRC, Freefall and Motion Source Status Register (Read Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ZHE

ZHP

YHE

YHP

XHE

XHP

Table 25. FF_MT_SRC register

Field

Description

Event Active Flag. Default value: 0.

0: No event flag has been asserted

1: One or more event flag has been asserted.

See the description of the OAE bit to determine the effect of the 3-axis event flags on the EA bit.

ZHE

Z Motion Flag. Default value: 0.

0: No Z Motion event detected

1: Z Motion has been detected

This bit reads always zero if the ZEFE control bit is set to zero

ZHP

Z Motion Polarity Flag. Default value: 0.

0: Z event was Positive g,

1: Z event was Negative g

This bit read always zero if the ZEFE control bit is set to zero

YHE

Y Motion Flag. Default value: 0.

0: No Y Motion event detected

1: Y Motion has been detected

This bit read always zero if the YEFE control bit is set to zero

YHP

Y Motion Polarity Flag. Default value: 0

0: Y event detected was Positive g

1: Y event was Negative g

This bit reads always zero if the YEFE control bit is set to zero

XHE

X Motion Flag. Default value: 0

0: No X Motion event detected

1: X Motion has been detected

This bit reads always zero if the XEFE control bit is set to zero

XHP

X Motion Polarity Flag. Default value: 0

0: X event was Positive g

1: X event was Negative g

This bit reads always zero if the XEFE control bit is set to zero

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