UPD17242 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD17242

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 (2/3)

Pin No.

4

5

6

7

8

9

10

11

12

13

Pin Name

P0E0

P0E1

P0E2

P0E3

REM

VDD

XOUT

XIN

GND

RESET

Function

Output Format After Reset

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

output mode in 1-bit units.

If this port is set to 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 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 not used,

it functions as a CMOS input port to/from which a resistor can be

connected/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.

A capacitor (15 pF) for oscillation can be connected by using a

mask option.

–

(Oscillation

stops)

Ground

–

–

System reset input. Turns ON pull down resistor if the POC or

–

Input

watchdog timer overflows and if the stack pointer overflows or

underflows, and resets the system. Usually, the pull-down resistor

is ON.

10

Data Sheet U15002EJ1V0DS

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