UPD62 NEC [NEC], UPD62 Datasheet - Page 6

• Manufacturer Part Number: UPD62
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

1. PIN FUNCTIONS
1.1 List of Pin Functions
6
Pin No.
1
2
15-20
3
4
5
6
7
8
9
10
11-14
Notes 1. Be careful about this because the drive capability of the low-level output side is held low.
K
S
S
REM
V
X
X
GND
RESET
K
2. In order to prevent malfunction, be sure to input a low level to more than one of pins K
Symbol
I/O0
0
1
DD
OUT
IN
I0
/LED
-K
reset is released (when RESET pin changes from low level to high level, or POC is released due to
supply voltage startup).
-K
I3
Note 2
I/O7
These pins refer to the 8-bit I/O ports. I/O switching can
be made in 8-bit units.
In INPUT mode, a pull-down resistor is added.
In OUTPUT mode, they can be used as the key scan
output of the key matrix.
Refers to the input port.
Can also be used as the key return input of the key
matrix.
In INPUT mode, the availability of the pull-down resistor
of the S
terms in 2-bit units.
If INPUT mode is canceled by software, this pin is placed
in OFF mode and enters the high-impedance state.
Refers to the I/O port.
In INPUT mode (S
return input of the key matrix.
The availability of the pull-down resistor of the S
ports can be specified by software in 2-bit units.
In OUTPUT mode (LED), it becomes the remote control
transmission display output (active low).
remote control carrier is output from the REM output, this
pin outputs the low level from the LED output synchronously
with the REM signal.
Refers to the infrared remote control transmission output.
The output is active high.
Carrier frequency: f
Refers to the power supply.
These pins are connected to system clock ceramic
resonators.
Refers to the ground.
Normally, this pin is a system reset input. By inputting
a low level, the CPU can be reset. When resetting with
the POC circuit (mask option) a low level is output. A
pull-up resistor is incorporated.
These pins refer to the 4-bit input ports.
They can be used as the key return input of the key
matrix.
The use of the pull-down resistor can be specified by
software in 4-bit units.
0
and S
1
ports can be specified by software in
1
), this pin can also be used as the key
f
X
X
/8, f
/128, f
Function
X
Data Sheet U14208EJ1V0DS00
/64, f
X
/192 (usable on software)
X
/96, high-level, f
When the
0
and S
X
/16,
1
CMOS
push-pull
CMOS push-pull
CMOS push-pull
Output Format
—
—
—
—
—
—
Note 1
High-level output
High-impedance
(OFF mode)
High-level output
(LED)
Low-level output
Low level
(oscillation stopped)
Input (low-level)
When Reset
I0
to K
—
—
—
I3
when
PD62