CHAPTER 2 PIN FUNCTIONS
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2.2.8 Keyboard Interface Signals
These signals are used to control a keyboard circuit to the V
R
4102. Table 2-8 describes the functions of these
signals.
Table 2-8. Keyboard Interface Signals
Signal
I/O
Description of function
KPORT[7..0]
I
This is a keyboard scan data input signal. It is used to scan for pressed keys on the keyboard.
KSCAN[11..0]/
GPIO[43..32]
O
These signal are used as keyboard scan data output signals and a general-purpose output port. The scan
line is set as active when scanning for pressed keys on the keyboard.
Pins that are not used for the key scan operation can be used as a general-purpose output port.
2.2.9 Audio Interface Signals
This signal is used to input/output audio signals. Table 2-9 describes the functions of this signal.
Table 2-9. Audio Interface Signals
Signal
I/O
Description of function
AUDIOOUT
O
This is an audio output signal. Analog signals that have been converted via the on-chip 10-bit D/A
converter are output.
AUDIOIN
I
This pin is the audio input pin.
2.2.10 Touch Panel/General Purpose A/D Interface Signals
These are the signals to the on-chip A/D converter of the V
R
4102. Four of these signals are used for a touch
panel, one is used for audio input, and the remaining three are used as general-purpose pins. Table 2-10 describes
the functions of these signals.
Table 2-10. Touch Panel/General Purpose A/D Interface Signals
Signal
I/O
Description of function
TPX[1..0]
I/O
This is an I/O signal that is used for the touch panel. It uses the voltage applied to the X coordinate and
the voltage input to the Y coordinate to detect which coordinates on the touch panel are being pressed.
TPY[1..0]
I/O
This is an I/O signal that is used for the touch panel. It uses the voltage applied to the Y coordinate and
the voltage input to the X coordinate to detect which coordinates on the touch panel are being pressed.
ADIN[2..0]
I
This is a general-purpose A/D input signal.