MXT1664T3-ATSQTP datasheet(54/98 Pages) MICROCHIP

54 / 98 page

MXT1664T3 2.0

DS40002054A-page 54

 2018 Microchip Technology Inc.

FIGURE 10-12:

SEND AUTO-RETURN – MESSAGE PACKET FORMAT

In Figure 10-12:

• Rpt ID is the USB report ID used is that for Object Protocol commands and responses (see Table 10-3 on page 50

for the value).

• 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 USB 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 report

ID for Object Protocol commands and responses (0x01) and a command byte of 0x00 (see Figure 10-13).

FIGURE 10-13:

SEND AUTO-RETURN – NULL COMMAND PACKET FORMAT

Note that any standard read/write operation (see Section 9.5.1 “Read/Write Memory Map Command”) or Start Debug

Monitoring (see Section 10.4.3 “Start Debug Monitoring”) command will also terminate any currently enabled auto-return

mode.

Figure 10-14 on page 55 shows an example sequence of packets to receive messages from the Message Processor

T5 object using the Send Auto-return command.

0xFA

0x00

ID Bytes

Message

Report ID

Msg ID

Message Data

Data

Data 0

...

Unused Bytes

(Packet Padded to 64 Bytes)

0x00

...

Rpt ID

0x00

Null

Command

Rpt ID

Reserved Bytes

(62 Bytes)

0x00

...

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