VR4102 datasheet(69/701 Pages) NEC

69 / 701 page

CHAPTER 2 PIN FUNCTIONS

2.2.8 Keyboard Interface Signals

These signals are used to control a keyboard circuit to the VR4102. Table 2-8 describes the functions of these

signals.

Table 2-8. Keyboard Interface Signals

Signal

I/O

Description of function

KPORT[7..0]

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]

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

This is an audio output signal. Analog signals that have been converted via the on-chip 10-bit D/A

converter are output.

AUDIOIN

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 VR4102. 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]

This is a general-purpose A/D input signal.

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