FXLS8471Q Datasheet, PDF (59/75 Pages) Freescale Semiconductor, Inc – Linear Accelerometer

10.10.2 TRANSIENT_SRC (0x1E) register
Transient event flag source register. This register provides the event status of the enabled axes and polarity (directional)
information.
Table 111. TRANSIENT_ CFG register
—
tran_ea
tran_zef
0
0
0
tran_zpol
0
tran_yef
0
tran_ypol
0
tran_xef
0
trans_xpol
0
Table 112. TRANSIENT_SRC bit descriptions
Field
tran_ea
tran_zef
tran_zpol
tran_yef
tran_ypol
tran_xef
tran_xpol
Description
Transient event active flag. Default value: 0
0: No transient event active flag has been asserted.
1: One or more transient event active flags has been asserted.
Z-axis transient event active flag. Default value: 0
0: Z-axis event flag is not active.
1: Z-axis event flag is active; Z-axis acceleration has exceeded the programmed threshold for the debounce time specified
in TRANS_COUNT.
Z-axis event flag polarity.
0: Z-axis event was above positive threshold value.
1: Z-axis event was below negative threshold value.
Y-axis transient event active flag. Default value: 0
0: Y-axis event flag is not active.
1: Y-axis event flag is active; Y-axis acceleration has exceeded the programmed threshold for the debounce time specified
in TRANS_COUNT.
Y-axis event flag polarity.
0: Y-axis event was above positive threshold value.
1: Y-axis event was below negative threshold value.
X-axis transient event active flag. Default value: 0
0: X-axis event flag is not active.
1: X-axis event flag is active; X-axis acceleration has exceeded the programmed threshold for the debounce time specified
in TRANS_COUNT.
X-axis event flag polarity.
0: X-axis event was above positive threshold value.
1: X-axis event was below negative threshold value.
When TRANSIENT_CFG[tran_ele] = 1, the TRANSIENT_SRC event flag(s) and polarity bits are latched when the interrupt event
is triggered, allowing the host application to determine which event flag(s) originally triggered the interrupt. When
TRANSIENT_CFG[tran_ele] = 0, events which occur after the event that originally triggered the interrupt will update the flag and
polarity bits, but once set, the flags can only be cleared by reading the TRANSIENT_SRC register.
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