NXP Semiconductors
UM11183
KITFS85SKTEVM evaluation board
UM11183
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User guide
Rev. 2.0 — 20 February 2019
34 / 50
Figure 24. Main panel
shows the mode selection. At first launch, the FlexGUI starts in User mode.
The user can then decide to switch to Test mode using the Switch mode drop-down list
followed by clicking
Apply
.
The
GUI-Device Status
field checks the connection from MCU to the device. The
ONLINE
status indicates a good connection, while
ERROR
status indicates an issue
(e.g. V
SUP
is not provided to the device).
The SPI/I2C communication bus can be changed at any time using the drop-down list.
This change is managed by the onboard MCU to communicate with the desired bus.
It is also possible to change the clock frequency using this panel.
Note that in the case of I2C, most of the time, the default address used by the device are
0x20 for main and 0x21 for the fail-safe.
The I2C address is managed differently in Debug and Normal mode
•
Debug mode :
–
I2C address when debug mode pin is set to 5.0 V are 0x20 for main and 0x21 for fail-
safe.
–
The user can change this address in the mirror register. The new address is taken
into account only after debug pin is released to 0 V.
•
Normal mode:
–
The address is burned in the OTP.
The user can read in which mode the device is operating. It is also possible to switch
from user mode to test mode (and vice-versa).
The current mode is displayed only when Poll button is activated. If required, this has to
be done at start up (Poll button is disabled by default). See