PD17P246_15 Datasheet, PDF (10/34 Pages) Renesas Technology Corp – PD17P246_15 FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROLLER

µPD17P246
2.1 Normal Operating Mode (2/3)
Pin No.
4
5
6
7
8
9
10
11
12
13
Symbol
P0E0
P0E1
P0E2
P0E3
REM
VDD
XOUT
XIN
GND
RESET
Function
Output Form After Reset
These pins constitute a 4-bit I/O port that can be set in the input or
output mode in 1-bit units.
If this port is set in the input mode when a key matrix is used, it
functions as a CMOS input port with a pull-up resistor and can be
used to input key return signals. If one of the pins of this port
goes low, the standby mode is released.
If this port is set in the output mode when a key matrix is used, it
functions as an N-ch open-drain output port and can be used to
output key matrix signals.
If this port is set in the input mode when a key matrix is not used,
it functions as a CMOS input port to/from which a resistor can be
connected or disconnected in 1-bit units. If this port is set in the
output mode when a key matrix is not used, it functions as a high-
current CMOS output port.
When key
matrix is
used: N-ch
open-drain,
when key
matrix is not
used: CMOS
push-pull
CMOS input
(when key
matrix is not
used and no
resistor
connected)
Outputs transfer signal for infrared remote controller.
Active-high output.
CMOS
push-pull
Low-level
output
Power supply
–
–
Connects ceramic resonator for system clock oscillation
–
(Oscillation
stops)
Ground
–
–
Reset input
Turns ON pull-down resistor if POC or watchdog timer overflows
and if the stack pointer overflows or underflows, and resets the
system. Usually, the pull-down resistor is ON.
–
Input
8
Data Sheet U15215EJ1V0DS