AN3393 datasheet(42/103 Pages) STMICROELECTRONICS

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State machine

AN3393

42/103

DocID018750 Rev 4

State machine

5.1

State machine definition

A state machine is a mathematical abstraction used to design logic connections. It is a

behavioral model composed of a finite number of states and transitions between states,

similar to a flow chart in which one can inspect the way logic runs when certain conditions

are met. The state machine begins with a start state (or 0 state), goes to different states

through transitions dependent on the inputs, and can finally end in a specific state (called

stop state). The current state is determined by the past states of the system.

Figure 3 shows a generic state machine.

Figure 3. Generic state machine

5.2

State machine in LIS3DSH

The LIS3DSH works as a normal accelerometer, generating acceleration output data.

However, these data can be used to perform a program in the embedded state machine

(Figure 4).

In the LIS3DSH accelerometer there are two different and independent finite state

machines, each one composed of 16 states. The two state machines can be programmed

AM14769V1

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