UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 7

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

1. PIN FUNCTIONS
1.1 PORT PINS (1/2)
P40-P43
P50-P53
Notes 1. The circuits enclosed in circles have a Schmitt-triggered input.
Pin name
P30
P31
P32
P33
P00
P01
P02
P03
P10
P11
P12
P13
P20
P21
P22
P23
P60
P61
P62
P63
P70
P71
P72
P73
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
2. An LED can be driven directly.
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
SO0/SB0
SI0/SB1
Also
used as
SCK0
PTO0
INT4
INT0
INT1
INT2
BUZ
PCL
TI0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
4-bit input port (port 0).
For P01 to P03, pull-up resistors can be
provided by software in units of 3 bits.
4-bit input port (port 1).
Pull-up resistors can be provided by software
in units of 4 bits.
4-bit I/O port (port 2).
Pull-up resistors can be provided by software
in units of 4 bits.
Programmable 4-bit I/O port (port 3).
Input/output can be specified bit by bit.
Pull-up resistors can be provided by software
in units of 4 bits.
N-ch open-drain 4-bit I/O port (port 4).
A pull-up resistor can be provided bit by bit
(mask option).
Withstand voltage is 10 V in open-drain mode.
N-ch open-drain 4-bit I/O port (port 5).
A pull-up resistor can be provided bit by bit
(mask option).
Withstand voltage is 10 V in open-drain mode.
Programmable 4-bit I/O port (port 6).
Input/output can be specified bit by bit.
Pull-up resistors can be provided by software
in units of 4 bits.
4-bit I/O port (port 7).
A pull-down resistor can be provided bit by bit
(mask option).
With noise elimination function
Function
8-bit I/O
Input
Input
Input
Input
High level
(when a pull-up
resistor is
provided) or
high impedance
High level
(when a pull-up
resistor is
provided) or
high impedance
Input
V
a pull-down
resistor is
provided) or
high impedance
SS
When reset
level (when
PD75238
I/O
circuit
type
M
F
F
B
E
E - B
E - C
Note 1
M
M
V
B
- A
- B
- C
- C
- C
7