
CHAPTER 2 PIN FUNCTIONS
User’s Manual U14579EJ2V0UM
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2.2.7
Touch panel interface signals
Table 2-8. Touch Panel Interface Signals
Signal Name
I/O
Function
TPX(1:0)/GPIO(17:16)
I/O
These are touch panel I/O signals. The coordinates at which the touch panel was pressed
are detected by applying voltage to the X coordinate and inputting the voltage of the Y
coordinate. The TPX1 signal should be connected to the ADX signal externally.
When these are not used as TPX signals, they can be used as general-purpose I/O ports.
TPY(1:0)/GPIO(19:18)
I/O
These are touch panel I/O signals. The coordinates at which the touch panel was pressed
are detected by applying voltage to the Y coordinate and inputting the voltage of the X
coordinate. The TPY1 signal should be connected to the ADY signal externally. The TYP1
signal is also used as a touch panel touch status interrupt request input to the PIU (see
9.3.2 PIUINTREG (base address + 0x0A4)).
When these are not used as TPY signals, they can be used as general-purpose I/O ports.
TPEN/GPIO20
I/O
This is the touch panel pull-down resistor enable signal.
When this is not used as a TPEN signal, it can be used as a general-purpose I/O port.
ADX
I
This is an analog input signal. It should be connected to the TPX1 signal externally when
the touch panel is used.
ADY
I
This is an analog input signal. It should be connected to the TPY1 signal externally when
the touch panel is used.
ADIN
I
This is a general-purpose analog input signal.
AUDIOIN
I
This is an audio analog input signal.
2.2.8
Audio interface signal
Table 2-9. Audio Interface Signal
Signal Name
I/O
Function
AUDIOOUT
O
This is an audio analog output signal.
2.2.9
General-purpose I/O signals
Table 2-10. General-Purpose I/O Signals
Signal Name
I/O
Function
GPIO(7:0)/KSCAN(7:0)
I/O
These are general-purpose I/O signals. See 2.2.5 Keyboard interface signals.
GPIO(15:8)/KPORT(7:0)
I/O
These are general-purpose I/O signals. See 2.2.5 Keyboard interface signals.
GPIO(17:16)/TPX(1:0)
I/O
These are general-purpose I/O signals. See 2.2.7 Touch panel interface signals.
GPIO(19:18)/TPY(1:0)
I/O
These are general-purpose I/O signals. See 2.2.7 Touch panel interface signals.
GPIO20/TPEN
I/O
This is a general-purpose I/O signal. See 2.2.7 Touch panel interface signals.