Datasheet

MMA8652FC
Sensors
Freescale Semiconductor, Inc. 43
6.9.2 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.
Table 60.
0x1E TRANSIENT_SRC register (Read-Only)
Back to Register Address Map
Bit
7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
— EA ZTRANSE Z_Trans_Pol YTRANSE Y_Trans_Pol XTRANSE X_Trans_Pol
Table 61. TRANSIENT_SRC register
Bit(s) Field Description
7 — Could be 0 or 1.
6EA
Event Active Flag
0 No event flag has been asserted (default)
1 One or more event flags has been asserted.
5 ZTRANSE
Z-transient event
0 No interrupt (default)
1 Z-transient acceleration greater than the value of TRANSIENT_THS event has occurred
4 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
3 YTRANSE
Y-transient event
0 No interrupt (default)
1 Y-transient acceleration greater than the value of TRANSIENT_THS event has occurred
2 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
1 XTRANSE
X-transient event
0 No interrupt (default)
1 X-transient acceleration greater than the value of TRANSIENT_THS event has occurred
0 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