AN3393 datasheet(51/103 Pages) STMICROELECTRONICS

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AN3393

Operation codes

103

If a new sample set (X, Y, Z, V) occurs, then TCy = TCy - 1:

–

If TCy > 0 (counter is not full): continue comparisons in the current state (wait for

new samples);

–

If TCy == 0 (counter is full): Timer TI1 condition (NEXT or RESET) is valid.

This condition affects or is affected by the following registers:

–

TIM3_y is 8 bits unsigned initial value;

–

PRy: Program and Reset pointer addresses.

6.1.5

TI4 (4h)

TI4 condition counts and evaluates the counter value of the TCy register.

If a new sample set (X, Y, Z, V) occurs, then TCy = TCy - 1:

–

If TCy > 0 (counter is not full): continue comparisons in the current state (wait for

new samples);

–

If TCy == 0 (counter is full): Timer TI1 condition (NEXT or RESET) is valid.

This condition affects or is affected by the following registers:

–

TIM4_y is 8 bits unsigned initial value;

–

PRy: Program and Reset pointer addresses.

6.1.6

GNTH1 (5h)

The GNTH1 condition is valid if any/triggered axis of the data sample set (X, Y, Z, V) is

greater than threshold 1 level.

Threshold is: THRS1_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:

–

THRS1_y: Threshold 1 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.

6.1.7

GNTH2 (6h)

The GNTH2 condition is valid if any/triggered axis of the data sample set (X, Y, Z, V) is

greater than 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.

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