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AT42QT1110-AU Datasheet(PDF) 16 Page - ATMEL Corporation |
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AT42QT1110-AU Datasheet(HTML) 16 Page - ATMEL Corporation |
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16 / 50 page  16 AT42QT1110-MU / AT42QT1110-AU [DATASHEET] 9520J–AT42–05/2013 4.1.6 Quick SPI Mode 4.1.6.1 Introduction In Quick SPI Mode, the QT1110 sends a 7-byte key report at each exchange. No host commands are required over SPI in this mode; the host clocks the data bytes out in sequence. Quick SPI mode is enabled by setting the SPI_EN bit in the Comms Options setup byte (see Section 7.5 on page 30). 4.1.6.2 Quick SPI Report The 7 report bytes are in the format given in Table 4-1. where: Byte 0 is a counter that increments from 0 to 254 on successive exchanges to confirm that firmware is operating correctly. Bytes 1 – 3 indicate the detect status of channels 0 – 3, 4 – 7 and 8 – 10 respectively (two bits per channel), as follows: 00 = Channel not in detect 01 = Channel in detect 10 = Not Allowed 11 = Invalid Signal (Channel disabled) Bytes 4 – 6 indicate the error status of channels 0 – 3, 4 – 7 and 8 – 10 respectively (two bits per channel), as follows: 00 = No error 01 = Not allowed 10 = Error on channel 11 = Invalid signal (channel disabled) Successive byte exchanges in Quick SPI mode cycle through the 7 bytes of status information. If synchronization is lost, the host must either re-synchronize by identifying the incrementing counter byte (byte 0) or pausing communications for at least 100 ms so the QT1110 will reset its SPI state. Table 4-1. Device Status Report Format Byte Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 Counter Counter – increments from 0 to 255 1 Detect status, channels 0 – 3 Channel 3 Channel 2 Channel 1 Channel 0 2 Detect status, channels 4 – 7 Channel 7 Channel 6 Channel 5 Channel 4 3 Detect status, channels 8 – 10 Reserved Channel 10 Channel 9 Channel 8 4 Error status, channels 0 – 3 Channel 3 Channel 2 Channel 1 Channel 0 5 Error status, channels 4 – 7 Channel 7 Channel 6 Channel 5 Channel 4 6 Error status, channels 8 – 10 Reserved Channel 10 Channel 9 Channel 8 |
Similar Part No. - AT42QT1110-AU_14 |
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Similar Description - AT42QT1110-AU_14 |
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