MXT1664T3-ATESSQTP datasheet(42/98 Pages) MICROCHIP

42 / 98 page

MXT1664T3 2.0

DS40002054A-page 42

 2018 Microchip Technology Inc.

FIGURE 9-3:

READ/WRITE MEMORY MAP – RESPONSE PACKET FORMAT

In Figure 9-3:

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

• Status indicates the result of the command:

- 0x00 = read and write completed; read data returned

- 0x04 = write completed; no read data requested

• NumRx is the number of bytes following that have been read from the memory map (in the case of a read). This

will be the same value as NumRx in the command packet.

• Data 0 to Data 14 are the data bytes read from the memory map.

9.5.1.2

Writing To the Device

A write operation cycle to the device consists of sending a packet that contains six header bytes. These specify the HID-

I2C report ID, the Command ID, the number of bytes to read, the number of bytes to write, and the 16-bit address pointer.

Subsequent bytes in a multi-byte transfer form the actual data. These are written to the location of the address pointer,

location of the address pointer +1, location of the address pointer + 2, and so on.

Figure 9-4 shows an example command packet to write four bytes of data to contiguous addresses starting at 0x1234.

FIGURE 9-4:

EXAMPLE OF A FOUR-BYTE WRITE COMMAND STARTING AT ADDRESS

0x1234

In Figure 9-4:

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

• 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 9-5 shows the response to this command. In this case, the result status returned is 0x04 (that is, the write

operation was completed but no read data was requested). Note that the report ID will be the same one used in the

command packet.

FIGURE 9-5:

RESPONSE TO EXAMPLE FOUR-BYTE WRITE

9.5.1.3

Reading From the Device

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

Figure 9-6 on page 43 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.

Read Data

Data 14

Rpt ID

Status

Number of

Bytes Read

Success/

Failure

NumRx

Data 0

...

Write Data

(4 Bytes)

0x51

0x06

Number

of Bytes

to Write

0x00

0x34

0x12

0x96

0x9B

0xA0

0xA5

Address Pointer

(LSByte, MSByte)

Number

of Bytes

to Read

Command

Rpt ID

Unused Bytes

(8 bytes)

0x00

...

Result

0x04

Rpt ID

Unused Bytes

(16 Bytes)

0x00

...

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