PD64A_15 Datasheet, PDF (8/66 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR INFRARED REMOTE CONTROL TRANSMISSION

µPD64A, 65
1. PIN FUNCTIONS
1.1 List of Pin Functions
Pin No.
Symbol
1
2
15 to 20
KI/O0 to KI/O7
3
S0
4
S1/LED
5
REM
Function
Output Format
8-bit I/O port. I/O can be switched in 8-bit units.
CMOS
In input mode, a pull-down resistor is added. push-pull^{Note 1}
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 S0 and
S1 ports can be specified by software in 2-bit units.
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 (S1), this pin can also be used as a key
return input from key matrix.
Use of a pull-down resistor for the S0 and S1 ports
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.
CMOS push-pull
Infrared remote control transmission output.
The output is active high.
Carrier frequency: fX/8, fX/64, fX/96, high-level, fX/16,
fX/128, fX/192 (usable on software)
CMOS push-pull
After Reset
High-level output
High impedance
(OFF mode)
High-level output
(LED)
Low-level output
6
VDD
7
XOUT
8
XIN
9
GND
10
S2
Power supply
Connecting ceramic resonators for system clock.
Ground.
Input port.
The use of a STOP mode release for the S2 port can be
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.)
—
—
—
Low level
(oscillation stopped)
—
—
—
Input
(high impedance,
STOP mode
release cannot be
used)
11 to 14 KI0 to KI3^{Note 2} 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.
—
Input (low level)
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 KI0 to KI3 pins when POC is released
due to supply voltage startup (these pins can be left open. When leaving open, keep pull-down
resistors connected).
6
Data Sheet U14380EJ3V0DS00