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AN463

更新时间： 2024-11-13 22:05:43

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		遥控遥控器
页数	文件大小	规格书
12页	114K
描述
60HC05K0 Infra-red Remote Control

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as AN463/D

MOTOROLA

S EMICONDUCTOR

APPLICATION NOTE

AN463

68HC05K0 Infra-red Rem ote Control

Tony Breslin,

MCU Applications Group,

Motorola Ltd., East Kilbride, Scotland

The MC68HC05K0 is a low cost, low pin count

single chip microcomputer with 504 bytes of user

ROM and 32 bytes of RAM. The MC68HC05K0 is

a member of the 68HC05K series of devices which

are available in 16-pin DIL or SOIC packages.

It uses the same CPU as the other devices in the

68HC05 family and has the same instructions and

registers. Additionally, the device has a 15-stage

multi-function timer and 10 general purpose

bi-directional I/0 lines. A mask option is available

for software programmable pull-downs on all of

the I/O pins and four of the pins are capable of

generating interrupts.

When a key on the remote control keypad is

pressed, the micro controller must first determine

what key is being pressed and generate an

individual code for the key. The key code is then

converted to a instruction code that is inserted into

the transmission command which, using a defined

protocol, is transmitted to the television receiver.

The command is continually transmitted as long as

the key is being held down.

As the remote control is battery powered it needs

to use as little power as possible. This is achieved

by entering STOP mode when no keys are being

pressed and effectively switches off the device.

The micro controller comes out of STOP mode

upon receipt of an interrupt request that is

generated when a key is pressed.

The device is ideally suited for remote-control

keyboard applications because the pull-downs and

the interrupt drivers on the port pins allow

keyboards to be built without any external

components except the keys themselves. There is

no need for external pull-up or pull-down resistors,

or diodes for wired-OR interrupts, as these features

are already designed into the device.

Rem ote Control Keyboard

The 68HC05K0 has ten general purpose I/O pins.

One of these is used for the transmission signal

output leaving nine pins for the keyboard control.

Of these, four pins on PortA have internal interrupt

request hardware. Using these four pins as inputs

allows key presses to be detected without any

external interrupt hardware. This leaves the five

remaining pins for outputs.

This application makes use of many of the device

features to control an infra-red television remote

control. The application could be very easily

modified to control any device with a similar

transmission protocol. It will run on any of the ‘K’

devices without modification.

Using the internal pull-down facility and the rising

edge interrupt request on the four inputs permits

interrupts to be generated. If the five outputs are

set to logic ‘1’, so driving an input from logic ‘0’

to logic ‘1’ w hen a key is pressed, an interrupt

request can be generated. Using this

arrangement a five by four keyboard matrix can be

used. An extra four keys can be controlled if the

Vdd line is used to drive one row of four keys to

logic ‘1’. Therefore the maximum amount of keys

controllable becomes twenty four.

Rem ote Control Specifications

The basic purpose of a television remote control is

to transmit a control instruction to the television.

The instruction is generated by a keystroke on the

remote control keyboard. The detection and

decoding of a key press and the transmission

encoding is carried out by the remote control micro

controller.

!MOTOROLA

12 3 4 5 6 7...12

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