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NJU3501

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3501

Qý TERMINAL DESCRIPTION 1

No. SYMBOL INPUT/OUTPUT

FUNCTION

1

PD0

INPUT/OUTPUT 2-bit Input / Output PORTD.

2

PD1

INPUT/OUTPUT Selects a terminal circuit for each port from follows by the

mask option.

xC-MOS Schmitt Trigger Input Terminal with

Pull-up Resistance(IB)

xC-MOS Schmitt Trigger Input terminal(ID)

xC-MOS Output Terminal(OB)

When the ports are selected as the input terminal, PD0

operates also as RESTART signal input terminal to return

from STANDBY mode, and PD1 operates also as the Edge

Detector Terminal.

3

PA0

INPUT/OUTPUT 4-bit Input / Output PORTA.

4

PA1

INPUT/OUTPUT Selects a terminal circuit for each port from follows by the

5

PA2

INPUT/OUTPUT mask option.

6

PA3

INPUT/OUTPUT xC-MOS Input Terminal with Pull-up Resistance(IA)

xC-MOS Input Terminal(IC)

xC-MOS Output Terminal(OB)

7

TEST

INPUT

Maker Testing Terminal with Pull-down Resistance

The terminal is recommended to connect to GND.

8

OSC1

9

OSC2

INPUT

OUTPUT

Internal Oscillator Terminals.

Connects a device selected from the ceramic or the crystal

resonator, or the resistor, to these terminals for the internal

oscillator.

In the external clock operation, OSC1 is the external clock

input terminal and OSC2 is normally open terminal.

10

VSS

–

Power Source (0V)

11

RESET

INPUT

RESET Terminal.

When the low level input-signal, the system is initialized.

12 EXTI / PE0

INPUT

1-bit Input PORTE.

Selects a function of either 1) or 2) for PORTE by the mask

option.

1) External Interrupt Input Terminal with Pull-up Resistance.

:EXTI

2) 1-bit Input Terminals as PORTE.

Selects a terminal circuit for each port from follows by the

mask option.

xC-MOS Schmitt Trigger Input Terminal with

Pull-up Resistance(IB)

xC-MOS Schmitt Trigger Input Terminal(ID)

13

PB0

14

PB1

15

PB2

16

PB3

INOUT

INOUT

INOUT

INOUT

4-bit Programmable Input / Output PORTB

These 4-bit terminals’ direction can be changed by the

program as 4-Input or 4-Output.

Use of Pull-up resistance is in accordance with the mask

option.

xas Input : C-MOS Input Terminals

xas Output : Nch-FET Open-Drain Output Terminals

Note ) INPUT/OUTPUT : Input or Output is selected by the mask option.

INOUT

: Input or Output is changed by the program.

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