6.2. User Switches (SW4, SW5)
User Interface (I/O)
The
user pushbutton
switches are in the
bottom right corner of
the LCEVB
There are two active high (pulled low, driven to 3.3 V) pushbutton switches on the LCEVB connected
directly to MCU GPIO ports. No configuration is required to use the switches.
SW4 is connected to port PA1 (which is also the NMI pin) and SW5 is connected to port PA2
NOTE
The MCU ports used on the user pushbutton switches are also routed
to the GPIO matrix.
6.3. Hex Encoded Switch (SW1)
The
hex encoder
switch is located to
the left of the
GPIO Matrix
There is a single hex encoded 16 position rotary switch on the LCEVB. This outputs a binary
encoded hex value (active high) on four MCU ports (Port D[0..3]).
Table 5. Hex Encoder Switch (SW2)
Position
HEX_SW4
HEX_SW3
HEX_SW2
HEX_SW1
(PD3)
(PD2)
(PD1)
(PD0)
0
0
0
0
0
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
A
1
0
1
0
B
1
0
1
1
C
1
1
0
0
D
1
1
0
1
E
1
1
1
0
F
1
1
1
1
Note that POSN 0 will ensure that no voltage is applied to the pads. This allows the pads to be used as
normal GPIO (with 10K pulldown) and accessed at the respective pads on the GPIO matrix area.
MPC5748G Low Cost EVB User Guide, User Guide, Rev. 1, 08/2016
NXP Semiconductors
15
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