MXT1664T3 datasheet(52/98 Pages) MICROCHIP

52 / 98 page

MXT1664T3 2.0

DS40002054A-page 52

 2018 Microchip Technology Inc.

In Figure 10-5 on page 51:

• Number of Bytes to Read is set to zero as this is a write-only operation.

• Number of Bytes to Write is six (that is, four data bytes plus the two address pointer bytes).

Figure 10-6 shows the response to this command. Note that the result status returned is 0x04 (that is, the write operation

was completed but no read data was requested).

FIGURE 10-6:

RESPONSE TO EXAMPLE FOUR-BYTE WRITE

10.4.1.3

Reading From the Device

A read operation consists of sending a packet that contains the six header bytes only and no write data.

Figure 10-7 shows an example command packet to read four bytes starting at address 0x1234. Note that the address

pointer is included in the number of bytes to write, so the number of bytes to write is set to 2 as there are no other data

bytes to be written.

FIGURE 10-7:

EXAMPLE OF A FOUR-BYTE READ 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 10-8 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 10-8:

RESPONSE TO EXAMPLE FOUR-BYTE READ

10.4.2

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 10-9.

Result

0x04

Rpt ID

Unused Bytes

(62 Bytes)

0x00

...

0x51

0x02

Number

of Bytes

to Write

0x04

0x34

0x12

Address Pointer

(LSByte, MSByte)

Number

of Bytes

to Read

Command

Rpt ID

Unused Bytes

(58 Bytes)

0x00

...

0x00

0x04

Number

of Bytes

Read

Read Data

(4 Bytes)

0x96

0x9B

0xA0

0xA5

Result

Rpt ID

Unused Bytes

(57 Bytes)

0x00

...

MXT1664T3 Datasheet(PDF) 52 Page - Microchip Technology

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