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AT42QT1110-MU

11-key QTouch® Touch Sensor IC

Atmel Corporation 

4.1.5.2 Get Instructions

Get instructions are instructions that read the data from a location in the QT1110 memory map.

Figure 4-7. Positive Recalibration Delay Get Instruction – CRC Disabled

Host (Sends on MOSI)

Device (Responds on MISO)

Command: 0xD5

Response: 0x55 (“Idle” – Fresh Command)

Simultaneous

Transmission

Null: 0x00

“Get” Data: 0x0C (Positive Recalibration Delay)

The host sends the appropriate Get command, followed by a Null byte. The QT1110 returns the contents of the

addressed memory location.

Figure 4-7 on page 15 shows the exchange for a report on the positive recalibration delay (assuming that the data

byte is 0x0C).

With CRC Enabled, this exchange takes 4 bytes, with a command CRC transmitted by the host and a report CRC

returned by the QT1110 (see Figure 4-8).

Figure 4-8. Positive Recalibration Delay Get Instruction – CRC Enabled

Host (Sends on MOSI)

Device (Responds on MISO)

Command: 0xD5

Response: 0x55 (“Idle” – Fresh Command)

Simultaneous

Transmission

Command CRC: 0x68

Response: 0x68 (Expected Command CRC)

Null: 0x00

“Get” Data: 0x0C (Positive Recalibration Delay)

Null: 0x00

“Get” CRC: 0xA3

AT42QT1110-MU / AT42QT1110-AU [DATASHEET]

15

9520J–AT42–05/2013

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