AN3393 datasheet(97/103 Pages) STMICROELECTRONICS

номер детали	AN3393

подробное описание детали	This document is intended to provide information

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AN3393

First-in first-out (FIFO) buffer

103

Figure 33. Stream-to-FIFO mode: interrupt not latched

Figure 34. Stream-to-FIFO mode: interrupt latched

Stream-to-FIFO can be used in order to analyze the sample history that generates an

interrupt; the standard operation is to read FIFO content when FIFO mode is triggered and

the FIFO buffer is full and stopped.

10.3.5

Bypass-to-Stream mode

This mode is a combination of the Bypass and Stream modes previously described. In

Bypass-to-Stream mode, the FIFO buffer starts operating in Bypass mode and switches to

Stream mode when INT2 occurs.

Follow these steps for Bypass-to-Stream mode configuration:

Configure State Machine 2 in order to generate an interrupt on INT2.

Turn on FIFO by setting the FIFO_EN bit to “1” in control register 6 (25h). After this

operation the FIFO buffer is enabled but is not collecting data, output registers are

frozen to the last sample set loaded.

Activate Bypass-To-Stream mode by setting the FMODE[2:0] field to “100” in the FIFO

control register (2Eh).

The interrupt trigger is related to the INT_SM2 bit in the STAT (18h) register and it is

generated even if the interrupt signal is not driven to an interrupt pad. Bypass-to-Stream

mode is sensitive to the trigger level and not to the trigger edge, this means that if Bypass-

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