UPD17244 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD17244

4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS

NEC => Renesas Technology 

µPD17240, 17241, 17242, 17243, 17244, 17245, 17246

1. PIN FUNCTIONS

1.1 Pin Function List (1/3)

Pin No.

28

29

1

2

3

Pin Name

P0D0

P0D1

P0D2

P0D3

P1B0/INT

Function

Output Format After Reset

These pins constitute a 4-bit I/O port which can be set to 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 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.

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 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

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 the resistor is pull-up or pull-down 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 not

used and no

resistor

connected)

Data Sheet U15002EJ1V0DS

9

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