L6364 datasheet(17/60 Pages) STMICROELECTRONICS

17 / 60 page

8.1.4

IO-Link UART peripheral (Multi-octet mode) state machine

Figure 7. IO-Link UART peripheral state machine

IO-Link mode

IOListen

+do : transitions on the CQ line

are read as data and stored in the

data buffer

Notes :

Initialization

SIO mode

SIOListen

+entry : start restart timer (trestart)

+entry : HS,LS switches are off

+do

: transitions on the CQ line are read

as data, and stored in the data buffer

Notes : the L6364 has received a short

circuit via a wake-up request from the

master

Notes : the CQ line is driven

according to the setting of the

CCTL:HS and CCTL:LS bits

Valid

master

message

read

SIOActive

Short

circuit/

Wake-up

trestart

elapsed

IO-LINK mode

set by the

microcontroller

Transmit mode

Transmit

Notes :waiting for data from

microcontroller or in the process of

transmitting data on the CQ channel

Master message read

or error in reception

Transmission complete, short detected

during transmission or aborted by writing a

LINK:END command [previous state was IO-

Link mode]

Transmission

complete, short

detected during

transmission or

aborted by

writing a

LINK:END

command

[previous state

was SIO mode]

8.1.5

Interrupt handling

The L6364 signals an event to the microcontroller using the INT pin, which is intended to be configured as a level

sensitive interrupt.

L6364

Multi-octet UART mode

DS13363 - Rev 4

page 17/60

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