FXLS8471Q datasheet(51/75 Pages) FREESCALE

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FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

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

—

a_ffmt_zhe

a_ffmt_zhp

a_ffmt_yhe

a_ffmt_yhp

a_ffmt_xhe

a_ffmt_xhp

00000000

Table 77. A_FFMT_SRC bit descriptions

Field

Description

a_ffmt_ea

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.

a_ffmt_zhe

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

a_ffmt_zhp

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

a_ffmt_yhe

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

a_ffmt_yhp

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

a_ffmt_xhe

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

a_ffmt_xhp

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

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