NJU3501
Q½
TERMINAL DESCRIPTION 1
No.
1
2
F U N C T I O N
2-bit Input / Output PORTD.
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.
4-bit Input / Output PORTA.
3
PA0
INPUT/OUTPUT
Selects a terminal circuit for each port from follows by the
4
PA1
INPUT/OUTPUT
5
PA2
INPUT/OUTPUT mask option.
xC-MOS
Input Terminal with Pull-up Resistance(IA)
6
PA3
INPUT/OUTPUT
xC-MOS
Input Terminal(IC)
xC-MOS
Output Terminal(OB)
Maker Testing Terminal with Pull-down Resistance
7
TEST
INPUT
The terminal is recommended to connect to GND.
Internal Oscillator Terminals.
8
OSC1
INPUT
Connects a device selected from the ceramic or the crystal
9
OSC2
OUTPUT
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.
V
SS
Power Source (0V)
10
–
RESET Terminal.
11
INPUT
RESET
When the low level input-signal, the system is initialized.
1-bit Input PORTE.
12 EXTI / PE0
INPUT
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)
4-bit Programmable Input / Output PORTB
13
PB0
INOUT
These 4-bit terminals’ direction can be changed by the
14
PB1
INOUT
program as 4-Input or 4-Output.
15
PB2
INOUT
Use of Pull-up resistance is in accordance with the mask
16
PB3
INOUT
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.
SYMBOL
PD0
PD1
INPUT/OUTPUT
INPUT/OUTPUT
INPUT/OUTPUT
NJU3501
n
TERMINAL DESCRIPTION 2
No.
SYMBOL
17 SDO
/ PC0
18 SDI(O) / PC1
19 SCK
/ PC2
INPUT/OUTPUT
F U N C T I O N
3-bit Input / Output PORTC.
SDO :OUTPUT
Selects a function of either 1) or 2) for PORTC by the mask
SDI(O) :INOUT
SCK
:INOUT option.
1) Serial Interface Function.
Serial Data Output Terminal : SDO
PC0 to PC2 :
Serial Data Input-Output Terminal with Pull-up
INPUT/OUTPUT
Resistance : SDI(O)
Serial Clock Input or Output Terminal with Pull-up
Resistance : SCK
2) 3-bit Input / Output Terminal PORTC.
Selects a terminal circuit for each port from follows by the
mask option.
xC-MOS
Input Terminal with Pull-up Resistance(IA)
xC-MOS
Input Terminal(IC)
xC-MOS
Output Terminal(OB)
V
DD
20
–
Power Source (2.4V to 5.5V)
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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