FXLS8471Q datasheet(59/75 Pages) FREESCALE

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FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

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.

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.

Table 111. TRANSIENT_ CFG register

—

tran_ea

tran_zef

tran_zpol

tran_yef

tran_ypol

tran_xef

trans_xpol

000

0000

Table 112. TRANSIENT_SRC bit descriptions

Field

Description

tran_ea

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.

tran_zef

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.

tran_zpol

Z-axis event flag polarity.

0: Z-axis event was above positive threshold value.

1: Z-axis event was below negative threshold value.

tran_yef

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.

tran_ypol

Y-axis event flag polarity.

0: Y-axis event was above positive threshold value.

1: Y-axis event was below negative threshold value.

tran_xef

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.

tran_xpol

X-axis event flag polarity.

0: X-axis event was above positive threshold value.

1: X-axis event was below negative threshold value.

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