MXT1664T3-ABESSQTP datasheet(44/98 Pages) MICROCHIP

44 / 98 page

MXT1664T3 2.0

DS40002054A-page 44

 2018 Microchip Technology Inc.

FIGURE 9-9:

SEND AUTO-RETURN – COMMAND PACKET FORMAT

In Figure 9-9:

• Rpt ID is the HID-I2C report ID used for Object Protocol commands and responses (see Table 9-2 on page 40).

• Command ID is the command ID for the Send Auto-return command (0x88)

• Reserved Bytes are reserved bytes with a value of 0x00.

Note that with this command, the command packet does not include an address pointer as the device already knows

the address of the Message Processor T5 object.

The response packet has the format given in Figure 9-10.

FIGURE 9-10:

SEND AUTO-RETURN – 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 9-11.

FIGURE 9-11:

SEND AUTO-RETURN – MESSAGE PACKET FORMAT

In Figure 9-11:

• Rpt ID is the HID-I2C report ID used for Object Protocol commands and responses (see Table 9-2 on page 40).

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

• Message Report ID is the report ID returned by the Message Processor T5 object. Note that this is the report ID

used in the Object Protocol and should not be confused with the HID-I2C report ID. Refer to the mXT1664T3 2.0

Protocol Guide for more information on the use of Object Protocol report IDs.

• 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. Any unused bytes are padded with zeros. Refer

to the mXT1664T3 2.0 Protocol Guide for more information on the messages from the various objects.

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

I2C report ID for Object Protocol commands and responses (see Table 9-2 on page 40) and a null command byte of

0x00 (see Figure 9-12).

FIGURE 9-12:

SEND AUTO-RETURN – NULL COMMAND PACKET FORMAT

0x88

Command

Rpt ID

Reserved Bytes

(12 Bytes)

0x00

...

Reserved Bytes

(12 Bytes)

0x00

...

0x88

Command

Received

Rpt ID

0xFA

0x00

ID Bytes

Message

Report ID

Msg ID

Data

Data 0

...

0x00

...

Rpt ID

Message Data

Unused Bytes

(Packet Padded to 14 Bytes)

0x00

Null

Command

Rpt ID

Reserved Bytes

(12 Bytes)

0x00

...

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