FXLS8471Q Datasheet, PDF (51/75 Pages) Freescale Semiconductor, Inc – Linear Accelerometer

10.8.2 A_FFMT_SRC (0x16) register
Freefall/motion source register. Read-only register.
This register keeps track of the acceleration event which is triggering (or has triggered, in case of A_FFMT_CFG[a_ffmt_ele]
= 1) the event flag. In particular A_FFMT_SRC[a_ffmt_ea] is set to a logic ‘1’ when the logical combination of acceleration event
flags specified in A_FFMT_CFG register is true. This bit is used in combination with the values in CTRL_REG4[int_en_ffmt] and
CTRL_REG5[int_cfg_ffmt] register bits to generate the freefall/motion interrupts.
Table 76. A_FFMT_SRC register
a_ffmt_ea
0
—
a_ffmt_zhe
0
0
a_ffmt_zhp
0
a_ffmt_yhe
0
a_ffmt_yhp
0
a_ffmt_xhe
0
a_ffmt_xhp
0
Table 77. A_FFMT_SRC bit descriptions
Field
a_ffmt_ea
a_ffmt_zhe
a_ffmt_zhp
a_ffmt_yhe
a_ffmt_yhp
a_ffmt_xhe
a_ffmt_xhp
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 A_FFMT_CFG[a_ffmt_oae] bit to determine the
effect of the 3-axis event flags on the a_ffmt_ea bit.
Z-high event flag. Default value: 0
0: Event detected
1: Z-high event has been detected
This bit always reads zero if the a_ffmt_zefe control bit is set to zero
Z-high event polarity flag. Default value: 0
0: Z event was positive g
1: Z event was negative g
This bit read always zero if the a_ffmt_zefe control bit is set to zero
Y-high event flag. Default value: 0
0: No event detected
1: Y-high event has been detected
This bit read always zero if the a_ffmt_yefe control bit is set to zero
Y-high event polarity flag. Default value: 0
0: Y event detected was positive g
1: Y event was negative g
This bit always reads zero if the a_ffmt_yefe control bit is set to zero
X-high event flag. Default value: 0
0: No event detected
1: X-high event has been detected
This bit always reads zero if the a_ffmt_xefe control bit is set to zero
X-high event polarity flag. Default value: 0
0: X event was positive g
1: X event was negative g
This bit always reads zero if the a_ffmt_xefe control bit is set to zero
Sensors
Freescale Semiconductor, Inc.
FXLS8471Q
51