UPD6P8 NEC [NEC], UPD6P8 Datasheet - Page 8

• Manufacturer Part Number: UPD6P8
• Description: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

1. PIN FUNCTIONS
1.1 Normal Operation Mode
8
Pin No.
1
2
15 to 20
3
4
5
6
7
8
9
10
11 to 14 K
(1)
Notes 1. Note that the drive capability of the low-level output side is held low.
PD6P8, 6P8A
K
S
S
REM
V
X
X
GND
S
K
2. In order to prevent malfunction, do not input a high-level signal to pins K
Symbol
I/O0
0
1
DD
OUT
IN
2
I0
I3
/LED
Note 2
to
open is possible, however, when these pins are left open, do not disconnect any connected pull-down
resistors) when POC is released due to supply voltage startup.
to K
I/O7
8-bit I/O port. I/O mode can be switched in 8-bit units.
In input mode, a pull-down resistor is added.
In output mode, these pins can be used as a key scan
outputs from the key matrix.
Input port.
This pin can also be used as a key return input from the
key matrix.
In input mode, the use of a pull-down resistor for the S
and S
If input mode is released by software, this pin is placed
in the OFF mode and enters a high-impedance state.
I/O port.
In input mode (S
return input from 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), this pin becomes the remote
control transmission display output (active low). When
the remote control carrier is output from the REM output,
this pin outputs a low level from the LED output in
synchronization with the REM signal.
Infrared remote control transmission output.
The output is active high.
The carrier high-level and low-level width can each be
freely set in a range of 250 ns to 64 s (@ f
using software.
Power supply
These pins are connected to system clock ceramic
resonators.
GND pin
Input port.
The use of the STOP mode release of the S
specified by software.
When using this pin as a key input from the key matrix,
enable the use of the STOP mode release (at this time,
a pull-down resistor is connected internally.)
When the STOP mode release is disabled, this pin can
be used as an input port that does not release the STOP
mode even if the release condition is established (at this
time, a pull-down resistor is not connected internally.)
4-bit input port.
These pins can be used as key return inputs to the key
matrix. The use of pull-down resistors 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 a key
Function
Data Sheet U17848EJ3V0DS
0
and S
2
port can be
X
= 4 MHz)
1
ports
0
CMOS
Push-pull
CMOS push-pull
CMOS push-pull
Output Format
—
—
—
—
—
—
Note 1
I0
PD6P8, 6P8A, 6P8B
to K
I3
High-level output
High-impedance
(OFF mode)
High-level output
(LED)
Low-level output
Low level
(oscillation stopped)
Input
(high impedance,
STOP mode
release cannot be
used)
Input (low-level)
(leaving these pins
After Reset
—
—