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AT42QT1111-MU Datasheet(PDF) 12 Page - ATMEL Corporation |
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AT42QT1111-MU Datasheet(HTML) 12 Page - ATMEL Corporation |
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12 / 50 page  12 9571A–AT42–02/10 AT42QT1111-MU/AT42QT1111-AU Figure 4-2. Sleep Command – CRC Enabled When the “Send Setups” command is received, the QT1111 stops measurement of QTouch sensors and waits for 42 bytes of data to be sent. Only when all 42 bytes have been received (and the CRC byte, if CRC is enabled), the QT1111 applies all the settings to RAM and resumes measurement. In this case, if CRC is enabled, the CRC byte is calculated for all the data sent by the host, including the command byte 0x01. Control Commands are specified in detail in Section5 on page22. 4.1.5 Report Requests Report Requests are sent by the Host to instruct the QT1111 to return status information. The host sends the appropiate “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 Host (Sends on MOSI) Command: 0x05 Simultaneous Transmission Command CRC: 0x3F Response: 0x3F (Expected Command CRC) Response: 0x55 ( Idle” Fresh Command) “ – Device (Responds on MISO) 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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