Master Input, Slave Output (Miso); Master Output, Slave Input (Mosi) - IDTECH SecureHead User Manual

3.3. Master Input, Slave Output (MISO)

The MISO signal is the serial data output sent from for the device, it's also the data line that is received
by the host. When the device is not active (Chip Select is high), the MISO becomes high impedance
(disconnected). The MISO signal would be in an indeterminate state after the device is power cycled or
reset for a maximum of 1 second. This signal should be ignored during this time.

3.4. Master Output, Slave Input (MOSI)

The MOSI signal is the serial data input for the device and serial data output for the host. This signal is
sent from the host (master) to the device (slave). The signal might not be required once some device
parameters such as the device key has been set and saved. Set the signal to be high if it is not being
used.
.
Copyright © 2010-2013, International Technologies & Systems Corporation. All rights reserved.
SecureHead SPI Interface with FPC User Manual
Page 10 of 67