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AN2335 Datasheet(PDF) 24 Page - STMicroelectronics

Part # AN2335
Description  This document is intended to give application
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2335 Datasheet(HTML) 24 Page - STMicroelectronics

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Free-Fall and Wake-Up Registers
AN2335
24/40
8
Free-Fall and Wake-Up Registers
The following sections describes the registers that are involved in the generation of the
interrupt signal associated to the inertial wake-up and free-fall events.
8.1
HP_FILTER_RESET (23h)
Dummy register. A reading at this address forces the high-pass filter to recover
instantaneously the dc level of the acceleration signal provided to its inputs. After the above
reading the output of the high-pass filter will be zero.
8.2
FF_WU_CFG_1 (30h)
Free-fall and wake-up configuration register for interrupt source 1.
.
XX
XX
XX
XX
AOI
LIR
ZHIE
ZLIE
YHIE
YLIE
XHIE
XLIE
AOI
And/Or combination of Interrupt events. Default value: 0
(0: OR combination of interrupt events; 1: AND combination of interrupt events)
LIR
Latch Interrupt request into FF_WU_SRC reg with the FF_WU_SRC reg cleared by
reading FF_WU_SRC_1 reg. Default value: 0
(0: interrupt request not latched; 1: interrupt request latched)
ZHIE
Enable interrupt generation on Z high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
ZLIE
Enable interrupt generation on Z low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
YHIE
Enable interrupt generation on Y high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
YLIE
Enable interrupt generation on Y low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
XHIE
Enable interrupt generation on X high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
XLIE
Enable interrupt generation on X low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)



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