VR4102 datasheet(70/701 Pages) NEC

70 / 701 page

CHAPTER 2 PIN FUNCTIONS

2.2.11 General-purpose I/O Signals

These are general-purpose I/O pins of the VR4102. Ordinary, 33 of the 49 GPIO pins are used as alternate-

function pins. Table 2-11 describes the functions of these signals.

Table 2-11. General-purpose I/O Signals

Signal

I/O

Description of function

GPIO[3..0]

I/O

These are maskable power-on factors. After start-up, they are used as ordinary GPIO pins.

GPIO[8..4]

I/O

These are ordinary GPIO pins.

GPIO[12..9]

I/O

These are maskable power-on factors. After start-up, they are used as ordinary GPIO pins.

GPIO[14..13]

I/O

These are ordinary GPIO pins.

DATA[31..16]/

GPIO[31..16]

I/O

See 2.2.1 System Bus Interface Signals.

KSCAN[11..0]/

GPIO[43..32]

See 2.2.8 Keyboard Interface Signals.

DDOUT/

GPIO[44]

See 2.2.7 Debug Serial Interface Signals.

DDIN/GPIO[45]

I/O

See 2.2.7 Debug Serial Interface Signals.

DRTS#/

GPIO[46]

See 2.2.7 Debug Serial Interface Signals.

DCTS#/

GPIO[47]

I/O

See 2.2.7 Debug Serial Interface Signals.

DBUS32/

GPIO[48]

I/O

See 2.2.1 System Bus Interface Signals.

GPIO[49]

I/O

This function differs depending on the operating status.

•

In normal operation

It can be used as a general-purpose output port.

•

After RTC reset

Input state. Input low level. Sampling occurs when the RTCRST signal changes from low to high.

VR4102 Datasheet(PDF) 70 Page - NEC

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