1 Introduction

This application note describes how to use the FlexIO module to emulate state

machine. Using State mode enables the user to implement any state machine

with up to eight states, eight outputs, and three selectable inputs per state. This

feature allows basic control functions to be offloaded from the CPU, which

could potentially remain in low power mode.

2 Development platform

In order to emulate the state machine, an i.MX RT1010 EVK board was used in this demo. In this application case, the used pins

are as shown in Figure 1.

Contents

1 Introduction............................................ 1

2 Development platform............................1

3 FlexIO state mode emulation.................3

4 Conclusion............................................. 6

5 References............................................ 6

AN12845

FlexIO Low Power State Machine on i.MX RT1010

Rev. 0 — May 2020

Application Note

Figure 1. Hardware connection

On the i.MX RT1010, FLEXIO has a total of 27 pins. The user can use the state mode to achieve up to 8 states, each state

controls up to eight pin outputs.

In this case, a total of three states are emulated. Each state enables three output pins, FXIO[0], FXIO[1], and FXIO[2]. These

three state machines can be controlled by three optional input pins. The three pins selected in this application are FXIO[21],

FXIO[22], and FXIO[23].

Table 1 lists the FlexIO pins used in this case:

Table 1. Used FlexIO pins

FlexIO pin Pin location Pin name State

flexio1.FLEXIO00 J56-10 GPIO_08 Enable output

Table continues on the next page...

NXP Semiconductors

Development platform

FlexIO Low Power State Machine on i.MX RT1010, Rev. 0, May 2020

Application Note 2 / 8