COMMANDS FROM THE HOST TO THE UR5HCSPI

Copyright Semtech 1997-2001

DOC5-SPI-DS-117

www.semtech.com

13

Commands from the Host - Summary

Command Name

Code

Description

Initialize

AOH

Causes the UR5HCSPI to enter the power-on state

Initialization Complete

A1H

Issued as a response to the “Initialize Request”

Heartbeat Request

A2H

The UR5HCSPI will respond with “Heartbeat Response”

Identification Request

F2H

The UR5HCSPI will respond with “Identification Response”

LED Status Request

A3H

The UR5HCSPI will respond with “LED Status Response”

LED Modify

A6H

The UR5HCSPI will change the LED accordingly

Resend Request

A5H

Issued upon error during the reception of a packet

Input/Output Mode Modify

A7H

The UR5HCSPI will modify or report the status of the GIO0 pin

Output Data to I/O pin

A8H

The UR5HCSPI will output a signal to the GIO0 pin

Set Wake-Up Keys

A9H

Defines which keys are “wake-up” keys

Each command to UR5HCSPI is composed of a sequence of codes. All commands start with <ESC> code (1BH)

and end with the LRC code (bitwise exclusive OR of all bytes).

Initialize

<ESC>

1BH

<INIT>

A0H

<LRC>

7BH

When the UR5HCSPI receives this command, it will clear all buffers and return to the power-on state.

Initialization Complete

<ESC>

1BH

<INIT COMPLETE>

A1H

<LRC>

7AH

When the UR5HCSPI receives this command, it will enable transmission of keyboard data. Keyboard data

transmission is disabled if the TX output buffer is full (32 bytes). Note that if the transmit data buffer gets full the

encoder will issue an "Initialize Request" to the host.

Heartbeat Request

<ESC>

1BH

<ONLINE>

A2H

<LRC>

79H

When the UR5HCSPI receives this command, it will reply with the Heartbeat Response Report.

Identification Request

<ESC>

1BH

<ID>

F2H

<LRC>

29H

The UR5HCSPI will reply to this command with the Identification Response Report.

COMMANDS FROM THE HOST TO THE UR5HCSPI ANALYTICALLY