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AT42QT1111-MU Datasheet(PDF) 15 Page - ATMEL Corporation |
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AT42QT1111-MU Datasheet(HTML) 15 Page - ATMEL Corporation |
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15 / 50 page  15 9571A–AT42–02/10 AT42QT1111-MU/AT42QT1111-AU 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 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 QT1111 (see Figure 4-8). Figure 4-8. Positive Recalibration Delay Get Instruction – CRC Enabled 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) Host (Sends on MOSI) Command: 0xD5 Null: 0x00 Null: 0x00 “Get” CRC: 0xA3 Simultaneous Transmission Command CRC: 0x68 Response: 0x68 (Expected Command CRC) “Get” Data: 0x0C (Positive Recalibration Delay) Response: 0x55 ( Idle” Fresh Command) “ – Device (Responds on MISO) |
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