MXT1664T3-C4BESSQTP datasheet(43/98 Pages) MICROCHIP

43 / 98 page

MXT1664T3 2.0

 2018 Microchip Technology Inc.

DS40002054A-page 43

FIGURE 9-6:

EXAMPLE OF A FOUR-BYTE READ COMMAND STARTING AT ADDRESS 0x1234

It is not necessary to set the address pointer before every read. The address pointer is updated automatically after every

read operation, so the address pointer will be correct if the reads occur in order.

Figure 9-7 shows the response to this command. The result status returned is 0x00 (that is the write operation was

completed and the data was returned). The number of bytes returned will be the same as the number requested (4 in

this case).

FIGURE 9-7:

RESPONSE TO EXAMPLE FOUR-BYTE READ

9.5.2

SEND AUTO-RETURN COMMAND

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 9-8.

FIGURE 9-8:

SEND AUTO-RETURN – PACKET SEQUENCE

The data packet for Send Auto-return commands consists of 14 bytes, made up of a 1-byte HID-I2C report ID followed

by 13 bytes of data. Note that this is different to the packet for standard read/write operations described in Section 9.5.1

“Read/Write Memory Map Command”.

The command packet has the format given in Figure 9-9.

0x51

0x02

Number

of Bytes

to Write

0x04

0x34

0x12

Address Pointer

(LSByte, MSByte)

Number

of Bytes

to Read

Command

Rpt ID

Unused Bytes

(12 Bytes)

0x00

...

0x00

0x04

Number

of Bytes

Read

Read Data

(4 Bytes)

0x96

0x9B

0xA0

0xA5

Result

Rpt ID

Unused Bytes

(11 Bytes)

0x00

...

Send Auto-return Command Packet

Response Packet

Message Data Packet

Null Packet to Terminate

Host

Device

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