AT42QT1111MU ATMEL [ATMEL Corporation], AT42QT1111MU Datasheet - Page 14
AT42QT1111MU
Manufacturer Part Number
AT42QT1111MU
Description
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
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AT42QT1111-MU/AT42QT1111-AU
Figure 4-5.
With CRC Enabled, a CRC byte is also required
transmitted bytes (that is, the “Set” command and the data byte).
For example, for the sequence shown in
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.
Host (Sends on MOSI)
Host (Sends on MOSI)
Positive Recalibration Delay Set Instruction – CRC Disabled
Positive Recalibration Delay Set Instruction – CRC Enabled
Response: 0x55 ( Idle”
Response: 0x95 (Command Just Received)
Response: 0x55 ( Idle”
Response: 0x95 (Command Just Received)
Response: 0x9F (Expected CRC)
Command CRC: 0x9F
Command: 0x95
“Set” Data: 0x0C
Command: 0x95
“Set” Data: 0x0C
Figure 4-5
“
“
–
–
Fresh Command)
Fresh Command)
(Figure
(0x95 — 0x0C), the CRC Byte is 0x9F. As is
Device (Responds on MISO)
Device (Responds on MISO)
4-6). This is calculated for the two
Simultaneous
Transmission
Simultaneous
Transmission
9571A–AT42–02/10
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