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

1.1 Pin Function List (3/3)

Pin No.

14

15

30

16

17

18

19

20

21

22

23

24

25

26

27

Pin Name

P1A0

P1A1

P1A2

P0A0

P0A1

P0A2

P0A3

P0B0

P0B1

P0B2

P0B3

P0C0

P0C1

P0C2

P0C3

Function

Output Format After Reset

These pins constitute a 3-bit I/O port that can be set to the input or When key

output mode in 1-bit units.

matrix is

If this port is set to the input mode when a key matrix is used, it used: N-ch

functions as a CMOS input port and can be used to input key open-drain,

return signals. At this time, whether a pull-up/down resistor is when key

connected to this port and the standby mode release condition matrix is not

(whether it is released when this pin is high or low) can be

used: CMOS

selected in 1-bit units

push-pull.

1. If connection of a resistor is specified and if it is specified that

the standby mode is released when this port goes low

... A pull-up resistor is connected. If a low level is input to

the set key, 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 port goes high

... A pull-down resistor is connected. If a high level is input

to the set key, 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 port goes low

(or high)

... No resistor is connected. If a low (or high) level is input to

the set key, the standby mode is released.

If this port is set to 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 to the input mode when a key matrix is used, it

functions as a CMOS input port.

Connection of a resistor to this port and whether the resistor is

pull-up or pull-down can be selected 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.

CMOS input

(when key

matrix is not

used and

no resistor

connected)

These pins are CMOS input pins with a 4-bit pull-up resistor.

They can be used to input the key return signals of a key matrix.

If any one of these pins goes low, the standby status is released.

–

CMOS input

with pull-up

resistor

These pins constitute a 4-bit I/O port that can be set to the input or

output mode in 1-bit units.

In the input mode, these pins are 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 is released when at least one of these

pins goes low.

In the output mode, they serve as N-ch open-drain output pins and

can be used to output the key return signals of a key matrix.

N-ch

open drain

These pins constitute a 4-bit I/O port that can be set to the input or

output mode in 4-bit units (group I/O).

In the input mode, these pins are 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 is released when at least one of these

pins goes low.

In the output mode, they serve as N-ch open-drain output pins and

can be used to output the key return signals of a key matrix.

N-ch

open drain

CMOS input

with pull-up

resistor

Low-level

output

Data Sheet U15002EJ1V0DS

11

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