MXT641T datasheet(40/74 Pages) ATMEL

40 / 74 page

mXT641T 1.0 [Datasheet]

9917JX–AT42–02/15

HID-I2C Communications

Figure 11-9. Response Packet Format

Once the device has responded to the command, it starts sending message data. Each time a message is generated in

the Message Processor T5 object, the device automatically sends a message packet to the host with the data. The

message packets have the format given in Figure 11-10.

Figure 11-10.Message Packet Format

In Figure 11-10:



Rpt ID is the HID-I2C Report ID used for Object Protocol commands and responses (see Table 11-1 on page 36).



ID Bytes identify the packet as an auto-return message packet.



Msg ID is the Report ID returned by the Message Processor T5 object.



Message Data bytes are the bytes of data returned by the Message Processor T5 object. The size of the data

depends on the source object for which this is the message data. Refer to the mXT641T 1.0 Protocol Guide for

more information.

To stop the sending of the messages, the host can send a null command packet. This consists of two bytes: a HID-I

report ID and a command byte of 0x00 (see Figure 11-11).

Figure 11-11.Null Command Packet Format

Note that any read or write will also terminate any currently enabled auto-return mode (see Section 11.5.1.2 on page 38).

0x88

0x00

Command

Received

Rpt ID

0xFA

0x00

Message

Report ID

ID Bytes

Msg ID

Message Data

Data

Data 0

...

Rpt ID

0x00

Null

Command

Rpt ID

MXT641T Datasheet(PDF) 40 Page - ATMEL Corporation

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