PD17P246_15 Datasheet, PDF (9/34 Pages) Renesas Technology Corp – PD17P246_15 FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROLLER

µPD17P246
2. PIN FUNCTIONS
2.1 Normal Operating Mode (1/3)
Pin No.
28
29
1
2
3
Symbol
P0D0
P0D1
P0D2
P0D3
P1B0/INT
Function
Output Form After Reset
These pins constitute a 4-bit I/O port which can be set in the input N-ch
or output mode in 4-bit units (group I/O).
open-drain
In the input mode, these pins serve as CMOS input pins with a
pull-up resistor, and can be used as the key return input lines of a
key matrix. The standby status must be released when at least
one of the input lines goes low. In the output mode, these pins are
used as N-ch open-drain output pins and can be used as the
output lines of a key matrix.
Low-level
output
This is an input port pin. Whether this pin functions as the P1B0
–
pin or the INT pin can be selected by the register file.
• P1B0
This is a 1-bit CMOS input port.
This port can be used to input a key return signal when a key
matrix is used. At this time, whether a pull-up/down resistor is
connected to this port and the standby mode release condition
(whether it is released when this pin is high or low) can be
selected.
1. If connection of a resistor is specified and if it is specified that
the standby mode is released when this pin goes low
... A pull-up resistor is connected. If a low level is input to
the P1B0 pin, the standby mode is released.
2. If connection of a resistor is specified and if it is specified that
the standby mode is released when this pin goes high
... A pull-down resistor is connected. If a high level is input to
the P1B0 pin, the standby mode is released.
3. If connection of a resistor is not specified and if it is specified
that the standby mode is released when this pin goes low
(or high)
... No resistor is connected. If a low (or high) level is input to
the P1B0 pin, the standby mode is released.
If a key matrix is not used, whether a resistor is connected and
whether a pull-up or pull-down resistor is connected can be
selected.
• INT
This is an external interrupt request signal. It can also be used
to release the standby mode if an external interrupt request
signal is input to this pin while the INT pin interrupt enable flag
(IP) is set.
P1B0 input
(when key
matrix is not
used and no
resistor
connected)
Data Sheet U15215EJ1V0DS
7