upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 9

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

1.
1.1
Pin No.
28
29
1
2
3
PIN FUNCTIONS
Pin Function List (1/3)
Pin Name
P1B
P0D
P0D
P0D
P0D
0
/INT
0
1
2
3
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
These pins constitute a 4-bit I/O port which can be set to the input
or output mode in 4-bit units (group I/O).
In the input mode, these pins serve as CMOS input pins with a
pull-up resistor, and can be used to input the key return signals 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 to output
the signals of a key matrix.
This is an input port pin. Whether this pin functions as the P1B
pin or the INT pin can be selected by the register file.
• P1B
• INT
This is a 1-bit CMOS input port.
This port can be used to input key return signals 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
2. If connection of a resistor is specified and if it is specified that
3. If connection of a resistor is not specified and if it is specified
If a key matrix is not used, whether a resistor is connected and
whether the resistor is pull-up or pull-down can be
selected.
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.
the standby mode is released when this pin goes low
... A pull-up resistor is connected. If a low level is input to the
the standby mode is released when this pin goes high
... A pull-down resistor is connected. If a high level is input to
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
0
P1B
the P1B
the P1B
0
pin, the standby mode is released.
0
0
pin, the standby mode is released.
pin, the standby mode is released.
Data Sheet U15002EJ1V1DS
Function
0
Output Format After Reset
N-ch
open drain
–
Low-level
output
P1B
(when key
matrix not
used and no
resistor
connected)
0
input
9