AT42QT1111-AU_14 datasheet(12/50 Pages) ATMEL

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AT42QT1111-MU / AT42QT1111-AU [DATASHEET]

9571C–AT42–05/2013

4.1.5

Report Requests

Report Requests are sent by the Host to instruct the QT1111 to return status information. The host sends the

appropriate Report Request command, then transmits Null bytes on MOSI while the QT1111 returns the report data

on MISO.

Figure 4-3.

All Keys Report – CRC Disabled

For example, Figure 4-3 on page 12 shows the exchange that takes place to read the 2-byte All Keys report. In this

exchange, the host sends:

0xC1

— 0x00 — 0x00

and the QT1111 returns (simultaneously):

0x55

— Report Byte 0 — Report Byte 1

If CRC is enabled, this exchange is extended to 5 bytes, as shown in Figure 4-4.

Host (Sends on MOSI)

Command: 0xC1

Device (Responds on MISO)

Null: 0x00

Key Status Report Byte 0

Null: 0x00

Key Status Report Byte 1

Simultaneous

Transmission

Response: 0x55 ( Idle”

Fresh Command)

“

–

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