D6P8A 查看數據表（PDF） - NEC => Renesas Technology

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D6P8A

4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

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µPD6P8, 6P8A, 6P8B

(2) µPD6P8B

Pin No. Symbol

1

2

15 to 20

KI/O0 to KI/O7

3

S0

Function

8-bit I/O port. I/O mode can be switched in 8-bit units.

In input mode, a pull-down resistor is added.

In output mode, these pins can be used as a key scan

outputs from the key matrix.

Input port.

This pin can also be used as a key return input from the

key matrix.

In input mode, the use of a pull-down resistor for the S0

and S1 ports can be specified by software in 2-bit units.

If input mode is released by software, this pin is placed

in the OFF mode and enters a high-impedance state.

Output Format

CMOS

Push-pullNote 1

—

4

S1/LED

5

REM

6

VDD

7

IC

9

GND

8

S3

10

S2

11 to 14 KI0 to

KI3Note 2

I/O port.

In input mode (S1), this pin can also be used as a key

return input from the key matrix.

The use of a pull-down resistor for the S0 and S1 ports

can be specified by software in 2-bit units.

In output mode (LED), this pin becomes the remote

control transmission display output (active low). When

the remote control carrier is output from the REM output,

this pin outputs a low level from the LED output in

synchronization with the REM signal.

Infrared remote control transmission output.

The output is active high.

The carrier high-level and low-level width can each be

freely set in a range of 250 ns to 64 µs (@ fX = 4 MHz)

using software.

Power supply

Internally connected pin

GND pin

Input port.

The use of the STOP mode release of the S2 and S3 ports

can be specified by software.

When using these pins as a key input from the key

matrix, enable the use of the STOP mode release (at this

time, a pull-down resistor is connected internally.)

When the STOP mode release is disabled, these pins

can be used as an input port that does not release the

STOP mode even if the release condition is established

(at this time, a pull-down resistor is not connected internally.)

4-bit input port.

These pins can be used as key return inputs to the key

matrix. The use of pull-down resistors can be specified

by software in 4-bit units.

CMOS push-pull

CMOS push-pull

—

—

—

—

—

After Reset

High-level output

High-impedance

(OFF mode)

High-level output

(LED)

Low-level output

—

—

—

Input

(high impedance,

STOP mode

release cannot be

used)

Input (low-level)

Notes 1. Note that the drive capability of the low-level output side is held low.

2. In order to prevent malfunction, do not input a high-level signal to pins KI0 to KI3 (leaving these pins

open is possible, however, when these pins are left open, do not disconnect any connected pull-down

resistors) when POC is released due to supply voltage startup.

Data Sheet U17848EJ3V0DS

9

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