AN3393 datasheet(49/103 Pages) STMICROELECTRONICS

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AN3393

Operation codes

103

Operation codes

Operation (OP) codes can be divided into two groups: NEXT/RESET conditions and

COMMANDS.

NEXT/RESET conditions are a combination of two conditions. All NEXT/RESET

conditions can be applied at any state and their evaluation occurs when a new sample

set (X, Y, Z, V) is generated. The two comparisons are executed in one single state;

NEXT/RESET conditions belonging to the same state are synchronized to the sample

clock.

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

three types of commands, depending on execution timing:

–

Immediately executed: commands executed immediately as they appear;

–

Executed after trigger: wait for internal or external trigger to continue;

–

Special command (JMP command): conditional jump command.

The OP codes have a direct effect on registers and internal memories. For some OP codes,

additional side-effects can occur (such as update of status information).

6.1

Next/reset conditions

Note:

Character “y” in the text is used to refer to State Machine 1 or State Machine 2.

Table 83. Conditions

OP code

Mnemonic

Description

Note

NOP

No operation

Execution moves to another

condition

TI1

Timer 1 (16-bit value) valid

No evaluation of data samples

TI2

Timer 2 (16-bit value) valid

No evaluation of data samples

TI3

Timer 3 (8-bit value) valid

No evaluation of data samples

TI4

Timer 4 (8-bit value) valid

No evaluation of data samples

GNTH1

Any/triggered axis greater than

THRS1

First axis triggers

GNTH2

Any/triggered axis greater than

THRS2

First axis triggers

LNTH1

Any/triggered axis less than or equal

to THRS1

First axis triggers

LNTH2

Any/triggered axis less than or equal

to THRS2

First axis triggers

GTTH1

Any/triggered axis greater than

THRS1 but using always standard

axis mask (MASK1)

First axis triggers

LLTH2

All axis less than or equal to THRS2

First masked axis triggers

GRTH1

Any/triggered axis greater than

reversed THRS1

First axis triggers

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