AN3393 datasheet(72/103 Pages) STMICROELECTRONICS

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Axis mask filter

AN3393

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Figure 13. Example of signed and unsigned thresholds

When the ABS bit is set to 0 in the SETTy register, thresholds are symmetric to the zero

level (refer to the first plot of Figure 13).

When the ABS bit is set to 1 in the SETTy register, thresholds are sign dependent (refer to

the second plot of Figure 13).

7.3

Temporary output mask

The temporary output masks (TMASK_A or TMASK_B) contain temporary results of trigger

events; basically, they represent the current active masks. The temporary output mask

value is set to the output register when one of the output commands (such as CONT, OUTC,

OUTW, etc....) is performed.

Depending on the triggered event, four different kinds of temporary mask are possible for

each axis:

Positive axis bit = 0 / Negative axis bit = 0, axis is not then triggered.

Positive axis bit = 0 / Negative axis bit = 1, negative data of axis is then triggered.

Positive axis bit = 1 / Negative axis bit = 0, positive data of axis is then triggered.

Positive axis bit = 1 / Negative axis bit = 1, not possible case.

The temporary output mask is cleared in the following cases:

–

when the program starts;

–

by using the REL command;

–

when the R_TAM bit in the SETTy register is set to 1. In this case, the temporary

output mask is set to default after every NEXT command.

As described in Section 7.1, MASKx registers contain information about the axes to

evaluate. However, when R_TAM = 0 (in SETTy register), only the first triggered axis is

placed on the temporary mask (TMASKx) and considered during program execution. In the

AM14779V1

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