AN3393 datasheet(55/103 Pages) STMICROELECTRONICS

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AN3393

Operation codes

103

6.1.15

LRTH2 (Eh)

The LRTH2 condition is valid if any/triggered axis of data sample set (X, Y, Z, V) is less than

or equal to reversed threshold 2 level.

Threshold is: THRS2_y - Hysteresis.

Hysteresis is:

–

State Machine 1: CTRL_REG1, bits HYST2_1, HYST1_1 and HYST0_1;

–

State Machine 2: CTRL_REG2, bits HYST2_2, HYST1_2 and HYST0_2.

This condition affects or is affected by the following registers:

–

THRS2_y: Threshold 2 value;

–

MASKy_A and MASKy_B: Axis mask filter values;

–

SETTy, bit ABS: Unsigned/signed settings;

–

SETTy, bit R_TAM: Release temporary output mask settings;

–

SETTy, bit P_DET: Peak detection settings;

–

PEAKy: Peak output value;

–

PRy: Program and Reset pointer addresses.

6.1.16

NZERO (Fh)

The NZERO condition is valid if any axis of data sample set (X, Y, Z, V) changes the sign.

No hysteresis is considered for this condition.

This condition affects or is affected by the following registers:

–

MASKy_A and MASKy_B: Axis mask filter values;

–

SETTy, bit ABS: Unsigned/signed settings;

–

SETTy, bit R_TAM: Release temporary output mask settings;

–

SETTy, bit P_DET: Peak detection settings;

–

PEAKy: Peak output value;

–

PRy: Program and Reset pointer addresses.

6.2

Commands

COMMANDS have special tasks for flow control, output and synchronization. There are

three types of commands, depending on execution timing:

–

Immediately executed: commands executed without waiting for a new sample;

–

Executed after trigger: wait for an internal or external trigger to proceed. The

internal trigger may be: wait for the new sample. The external trigger may be: wait

for reading of the OUTS register;

–

Special commands (JMP commands): special conditions comparison for

conditional jump commands.

Note:

Character “y” in the text refers to State Machine 1 or State Machine 2.

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