NJU3502
„#
TERMINAL DESCRIPTION 1
No.
22
23
1
2
INPUT/OUTPUT
F U N C T I O N
4-bit Input / Output PORTC.
INPUT/OUTPUT
Selects a terminal circuit for each port from follows by the
INPUT/OUTPUT
INPUT/OUTPUT mask option.
xC-MOS
Input Terminal with Pull-up Resistance(IA)
INPUT/OUTPUT
xC-MOS
Input Terminal(IC)
xC-MOS
Output Terminal(OB)
3
PD0
INPUT/OUTPUT
2-bit Input / Output PORTD.
Selects a terminal circuit for each port from follows by the
4
PD1
INPUT/OUTPUT
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.
5
PA0
INPUT/OUTPUT
Selects a terminal circuit for each port from follows by the
6
PA1
INPUT/OUTPUT
7
PA2
INPUT/OUTPUT mask option.
xC-MOS
Input Terminal with Pull-up Resistance(IA)
8
PA3
INPUT/OUTPUT
xC-MOS
Input Terminal(IC)
xC-MOS
Output Terminal(OB)
Maker Testing Terminal with Pull-down Resistance
9
TEST
INPUT
The terminal is recommended to connect to GND.
Internal Oscillator Terminals.
10
OSC1
INPUT
Connects a device selected from the ceramic or the crystal
11
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)
12
–
RESET Terminal.
13
INPUT
RESET
When the low level input-signal, the system is initialized.
1-bit Input PORTE.
14 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)
Note )
INPUT/OUTPUT : Input or Output is selected by the mask option.
INOUT
: Input or Output is changed by the program.
SYMBOL
PC0
PC1
PC2
PC3
NJU3502
„#
TERMINAL DESCRIPTION 2
No.
SYMBOL
INPUT/OUTPUT
F U N C T I O N
2-bit Input / Output PORTF.
15 SDO
/ PF0 SDO :OUTPUT
Selects a function of either 1) or 2) for PORTF by the mask
16
PF0 :OUTPUT
SDI(O) / PF1 SDI(O) :INOUT option.
1) Serial Interface Function
PF1 :
Serial Data Output Terminal : SDO
INPUT/OUTPUT
Serial Data Input-Output Terminal with Pull-up
Resistance : SDI(O)
2) 2-bit Input / Output Terminals as PORTF.
Selects a terminal circuit for each port from follows by the
mask option.
xC-MOS
Input Terminal with Pull-up Resistance (IA):PF1
xC-MOS
Input Terminal(IC):PF1
xC-MOS
Output Terminal(OB):PF0,PF1
Selects a function of either 1) or 2) by the mask option.
17
SCK /
SCK
:INOUT
1) Serial Clock Input or Output Terminal with Pull-up
CKOUT
CKOUT :
Resistance. :SCK
OUTPUT
2) Clock Divided by Pre-scaler Output Terminal with Pull-up
Resistance. :CKOUT
Selects the dividing times of the clock in the pre-scaler by the
mask option.
4-bit Programmable Input / Output PORTB
18
PB0
INOUT
These 4-bit terminals’ direction can be changed by the
19
PB1
INOUT
program as 4-Input or 4-Output.
20
PB2
INOUT
Use of Pull-up resistance is in accordance with the mask
21
PB3
INOUT
option.
xas
Input : C-MOS Input Terminals
xas
Output: Nch-FET Open-Drain Output Terminal
V
DD
24
–
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.
Embedded System
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