MXT641T datasheet(39/74 Pages) ATMEL

39 / 74 page

mXT641T 1.0 [Datasheet]

9917JX–AT42–02/15

HID-I2C Communications

Figure 11-6. Response to Example Four-byte Read

11.5.2 Send Auto-return Messages

With this command the device can be configured to return new messages from the Message Processor T5 object

autonomously. The packet sequence to do this is shown in Figure 11-7.

Figure 11-7. Packet Sequence for “Send Auto-return” Command

The HID-I2C Report ID used is that for Object Protocol commands and responses; see Table 11-1 on page 36 for the

value.

The command packet has the format given in Figure 11-8.

Figure 11-8. Command Packet Format

In Figure 11-8:



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



Res 0 to Res 5 are reserved bytes with a value of 0x00.

The response packet has the format given in Figure 11-9. 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.

0x51

0x02

Number

of Bytes

to Write

0x04

0x34

0x12

Address Pointer

(LSB, MSB)

Number

of Bytes

to Read

Command

Report ID

for OBP

0x06

Send Auto-return Command Packet

Response Packet

Message Data Packet

Null Packet to Terminate

Host

Device

Res 1

Res 0

Res 4

Res 3

Res 2

Reserved Bytes

(=0x00)

0x88

Command

Res 5

Rpt ID

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