upd64a Renesas Electronics Corporation., upd64a Datasheet - Page 6

• Manufacturer Part Number: upd64a
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

1. PIN FUNCTIONS
1.1 List of Pin Functions
6
1
2
15 to 20
3
4
5
6
7
8
9
10
11 to 14
Pin No.
Notes 1. Be aware that the drive capability of the low-level output side is held low.
2. In order to prevent malfunction, do not input a high level to all the K
K
S
S
REM
V
X
X
GND
S
K
I/O0
0
1
DD
OUT
IN
2
I0
/LED
Symbol
due to supply voltage startup (these pins can be left open. When leaving open, keep pull-down
resistors connected).
to K
to K
I3
Note 2
I/O7
8-bit I/O port. I/O 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 key scan
outputs from the key matrix.
Input port.
Can also be used as a key return input from key matrix.
In input mode, use of a pull-down resistor for the S
S
If input mode is canceled 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 key matrix.
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 synchronously with the REM signal.
Infrared remote control transmission output.
The output is active high.
Carrier frequency: f
Power supply
Connecting ceramic resonators for system clock.
Ground.
Input port.
The use of a STOP mode release for the S
specified by software. When using this pin as a key input
from a 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 inter-
nally.)
4-bit input port.
These pins can be used as key return inputs from the key
matrix.
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 a key
f
X
X
/8, f
/128, f
Data Sheet U14380EJ3V0DS00
Function
X
/64, f
X
/192 (usable on software)
X
/96, high-level, f
0
and S
2
port can be
1
ports
X
/16,
0
and
CMOS
push-pull
CMOS push-pull
CMOS push-pull
Output Format
I0
to K
—
—
—
—
—
—
Note 1
I3
pins when POC is released
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)
After Reset
—
—
PD64A, 65