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AT42QT1111-AU Datasheet(PDF) 14 Page - ATMEL Corporation |
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AT42QT1111-AU Datasheet(HTML) 14 Page - ATMEL Corporation |
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14 / 50 page  14 AT42QT1111-MU / AT42QT1111-AU [DATASHEET] 9571C–AT42–05/2013 With CRC Enabled, a CRC byte is also required (Figure 4-6). This is calculated for the two transmitted bytes (that is, the Set command and the data byte). For example, for the sequence shown in Figure 4-5 (0x95 – 0x0C), the CRC Byte is 0x9F. As is the case with the other command types, when the QT1111 is expecting a CRC byte from the host, it calculates that byte in advance and returns the expected value to the host in the same transmission as the host sends the CRC byte. The sent data is not applied to the memory location until the CRC byte has been received and verified. Figure 4-6. Positive Recalibration Delay Set Instruction – CRC Enabled 4.1.5.2 Get Instructions Get instructions are instructions that read the data from a location in the QT1111 memory map. Figure 4-7. Positive Recalibration Delay Get Instruction – CRC Disabled The host sends the appropriate Get command, followed by a Null byte. The QT1111 returns the contents of the addressed memory location. Figure 4-7 on page 14 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 QT1111 (see Figure 4-8). Host (Sends on MOSI) Command: 0x95 “Set” Data: 0x0C Response: 0x95 (Command Just Received) Simultaneous Transmission Command CRC: 0x9F Response: 0x9F (Expected CRC) Response: 0x55 ( Idle” Fresh Command) “ – Device (Responds on MISO) Host (Sends on MOSI) Command: 0xD5 Null: 0x00 “Get” Data: 0x0C (Positive Recalibration Delay) Simultaneous Transmission Response: 0x55 ( Idle” Fresh Command) “ – Device (Responds on MISO) |
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