As shown in – Rainbow Electronics AT42QT1110-AZ User Manual

Page 14

9570H–AT42–02/10

AT42QT1110-MZ/AT42QT1110-AZ

Figure 4-5.

Positive Recalibration Delay Set Instruction – CRC Disabled

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 QT1110 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

Host (Sends on MOSI)

Command: 0x95

“Set” Data: 0x0C

Response: 0x95 (Command Just Received)

Simultaneous

Transmission

Response: 0x55 ( Idle”

Fresh Command)

“

–

Device (Responds on MISO)