UPD62A NEC, UPD62A Datasheet - Page 6

• Manufacturer Part Number: UPD62A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

1. PIN FUNCTIONS
1.1 List of Pin Functions
6
Pin No.
1
2
15 to 20
3
4
5
6
7
8
9
10
11 to 14
Notes 1. Be aware that 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
I0
I/O0
0
1
DD
OUT
IN
/LED
to K
reset is released (when the RESET pin changes from low level to high level, or POC is released due
to supply voltage startup).
to K
I3
Note 2
I/O7
8-bit input/output port
Input/output can be specified in 8-bit units.
In input mode, a pull-down resistor is added.
In output mode, these pins can be used as the key scan
output of the key matrix.
Input port
Can also be used as the key return input of the key
matrix.
In input mode, the use of a pull-down resistor for the S
and S
If input mode is canceled by software, this pin is placed
in OFF mode and enters the high-impedance state.
Input/output port
In input mode (S
return input of the key matrix.
The use of a pull-down resistor for the S
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 a low level from the LED output synchronously
with the REM signal.
Infrared remote control transmission output.
The output is active high.
Carrier frequency: f
Power supply
These pins are connected to system clock ceramic
resonators.
Ground
Normally, this pin is the 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 connected to this pin.
4-bit input port
These pins can be used as the key return input of the key
matrix.
The use of a pull-down resistor can be specified by
software in 4-bit units.
1
ports can be specified by software in 2-bit units.
1
), this pin can also be used as the key
f
X
X
/8, f
/128, f
Function
X
Data Sheet U14474EJ1V0DS00
/64, f
X
/192 (software supporting)
X
/96, high-level, f
0
and S
When the
1
X
/16,
ports
0
CMOS
push-pull
CMOS push-pull
CMOS push-pull
After Format
—
—
—
—
—
—
Note 1
High-level output
High-impedance
(OFF mode)
High-level output
(LED)
Low-level output
Low level
(oscillation stopped)
Input (low-level)
After Reset
I0
to K
—
—
—
I3
when
PD62A