MMA8652FC datasheet(50/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.10.2

0x1E TRANSIENT_SRC register

The transient source register provides the status of the enabled axes and the polarity (directional) information. When the

TRANSIENT_SRC register is read, it clears the interrupt for the transient detection.

When new events arrive while EA = 1, additional *TRANSE bits may get set, and the corresponding *_Trans_Pol flag become

updated. However no *TRANSE bit may get cleared before the TRANSIENT_SRC register is read.

•

When the EA bit gets set while ELE = 1, all other status bits get frozen at their current state.

•

By reading the TRANSIENT_SRC register, all bits get cleared.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

—

ZTRANSE

Z_Trans_Pol

YTRANSE

Y_Trans_Pol

XTRANSE

X_Trans_Pol

Figure 42. 0x1E TRANSIENT_SRC register (Read-Only)

Table 41. TRANSIENT_SRC register

Bit(s)

Field

Description

6EA

Event Active Flag

0 No event flag has been asserted (default)

1 One or more event flags has been asserted.

ZTRANSE

Z transient event

0 No interrupt (default)

1 Z transient acceleration greater than the value of TRANSIENT_THS event has occurred

Z_Trans_Pol

Polarity of Z Transient Event that triggered the interrupt

0 Z event was positive g (default)

1 Z event was negative g

3YTRANSE

Y transient event

0 No interrupt (default)

1 Y transient acceleration greater than the value of TRANSIENT_THS event has occurred

Y_Trans_Pol

Polarity of Y Transient Event that triggered the interrupt

0 Y event was Positive g (default)

1 Y event was Negative g

1XTRANSE

X transient event

0 No interrupt (default)

1 X transient acceleration greater than the value of TRANSIENT_THS event has occurred

X_Trans_Pol

Polarity of X Transient Event that triggered the interrupt

0 X event was Positive g (default)

1 X event was Negative g

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