Datasheet

DocID17530 Rev 2 41/54

LIS3DH Registers description

8.20 FIFO_SRC_REG (2Fh)

Table 52. FIFO_SRC_REG description

8.21 INT1_CFG (30h)

Content of this register is loaded at boot.

Table 51. FIFO_SRC_REG register

WTM OVRN_FIFO EMPTY FSS4 FSS3 FSS2 FSS1 FSS0

WTM WTM bit is set high when FIFO content exceeds watermark level

OVRN_FIFO OVRN bit is set high when FIFO buffer is full; this means that the FIFO buffer

contains 32 unread samples. At the following ODR a new sample set replaces the

oldest FIFO value. The OVRN bit is set to 0 when the first sample set has been

read

EMPTY EMPTY flag is set high when all FIFO samples have been read and FIFO is empty

FSS [4:0] FSS [4:0] field always contains the current number of unread samples stored in the

FIFO buffer. When FIFO is enabled, this value increases at ODR frequency until

the buffer is full, whereas, it decreases every time one sample set is retrieved from

FIFO.

Table 53. INT1_CFG register

AOI 6D ZHIE ZLIE YHIE YLIE XHIE XLIE

Table 54. INT1_CFG description

AOI And/Or combination of Interrupt events. Default value: 0 Refer to Table 55: Interrupt mode

6D 6 direction detection function enabled. Default value: 0Refer to Table 55: Interrupt mode

ZHIE Enable interrupt generation on Z high event or on Direction recognition. Default value: 0

(0: disable interrupt request;1: enable interrupt request)

ZLIE Enable interrupt generation on Z low event or on Direction recognition. Default value: 0 (0:

disable interrupt request;1: enable interrupt request)

YHIE Enable interrupt generation on Y high event or on Direction recognition. Default value: 0

(0: disable interrupt request; 1: enable interrupt request.)

YLIE Enable interrupt generation on Y low event or on Direction recognition. Default value: 0 (0:

disable interrupt request; 1: enable interrupt request.)

XHIE Enable interrupt generation on X high event or on Direction recognition. Default value: 0

(0: disable interrupt request; 1: enable interrupt request.)

XLIE Enable interrupt generation on X low event or on Direction recognition. Default value: 0 (0:

disable interrupt request; 1: enable interrupt request.)