AN3393 datasheet(31/103 Pages) STMICROELECTRONICS

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AN3393

103

4.23

FIFO_CTRL (2Eh)

The FIFO trigger is the INT2 source.

For more information about FIFO refer to Section 10.

4.24

FIFO_SRC (2Fh)

Table 37. FIFO_CTRL description

Bit

Name

FMODE2

FMODE1

FMODE0

WTMP4

WTMP3

WTMP2

WTMP1

WTMP0

Default

00000000

Table 38. FIFO_CTRL bit description

Bit name

Description

FMODE[2:0]

FIFO mode. Default value: 0

(see Table 39 for FIFO modality)

WTMP[4:0]

FIFO watermark pointer. It is the FIFO depth when the watermark is enabled

(see Section 10.4).

Table 39. FIFO mode description

FMODE2

FMODE1

FMODE0

Mode description

Bypass mode. FIFO turned off.

FIFO mode. Stops collecting data when FIFO is full.

010

Stream mode. If the FIFO is full, the new sample overwrites

the older one (circular buffer).

Stream mode until trigger is de-asserted, then FIFO mode.

100

Bypass mode until trigger is de-asserted, then Stream

mode.

Not to use.

Bypass mode until trigger is de-asserted, then FIFO mode.

Table 40. FIFO_CTRL description

Bit

Name

WTM

OVRN_FIFO

EMPTY

FSS4

FSS3

FSS2

FSS1

FSS0

Default

00000

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