NXP Semiconductors EVB-VF522R3, User Manual, Page: 27 / 38

EVB-VF522R3 Platform User’s Guide, Rev. 0, 11/2014
26 Freescale Semiconductor, Inc.
User I/O and control
14.3.2 Radio preset buttons (SW3 to SW6)
There are four active-high push buttons connected to GPIOs as shown in Table 9 ). These can be used as
general purpose switches or for radio presets should this hardware be used for a car radio development.
14.4 MLB daughtercard connector (P22)
There is a 40-pin MLB (Media Local Bus) interface connector (P22) on the EVB for connecting a
daughtercard shown in
Figure 25 ). There are no hardware configuration options on the EVB in relation to
the MLB card.
Figure 25. MLB daughtercard
NOTE
The daughtercard Reset input is connected to output 3 of the Peripheral
Reset-Control Multiplexer (see
Section 7, “Peripheral reset-control
multiplexer ”). When reset, its outputs are in the high-impedance state, but,
thanks to a pull-down resistor on the reset line, the daughtercard is reset
until the line is actively driven by the MCU via the Peripheral Reset-Control
Multiplexer.
CAUTION
Ensure that the EVB is powered OFF prior to fitting or removal of the
daughtercard.
Table 9. Radio preset buttons
Switch Preset No Respective MCU Pin
SW4 1 FB_AD31
SW6 2 FB_AD30
SW5 3 FB_AD29
SW3 4 SAI0_RX_SYNC