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參數(shù)資料
| 型號(hào)： | 68HC05K0 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 111K |
| 代理商： | 68HC05K0 |
MOTOROLA
2
AN463/D
Figure 1
Keyboard layout with associated scanned and transmitted codes
1
2
3
4
5
6
7
8
9
0
NORM
MUTE
PC+
PC-
VOL+
VOL-
TV/
TEXT
MIX
CON+
CON-
STOP
SUB-
PAGE
INDEX
TIME
VDD
A7
A6
A5
A4
B0
A0
A1
A2
A3
31
32
34
38
11
12
13
00
71
72
74
78
b1
b2
b4
b8
d1
d2
d4
d8
e1
e2
e4
e8
f1
f2
f4
f8
14
15
16
01
17
18
19
06
10
2c
2d
07
39
3b
3a
0c
3e
3d
3c
0d
A depressed key will set one of the input columns
to logic ‘1’. By scanning the columns, and setting
each row output to logic ‘0’ and then checking if the
inputs all become logic ‘0’, the associated row for
the key can be determined. If rotating the logic ‘0’
through the five output pins fails to identify a key
column, then the key must be connected to the
Vdd line. This process gives an individual code for
each key which is a combination of the code from
the column inputs and the row outputs. This can
then be decoded to an instruction that is inserted
into the output signal for transmission.
Figure 1
shows the layout of the keyboard on the
left and the scanned and transmitted codes on the
right. The keyboard layout incorporates the various
television controls plus controls for TELETEXT. On
the left hand side the codes returned from
scanning the keyboard are shown in the upper
right-hand corner of each key and the code sent for
transmission for that key instruction are shown in
the bottom left-hand corner. The I/O pins for each
row and column are also shown for each key.
Transmission Protocol
The transmission protocol in this application is that
used by the MC144105 IR Remote Control
Transmitter. It uses a binary coded 9-bit data word
with the LSB being transmitted first. Each bit of the
transmitted signal is in the form of a bi-phase pulse
code modulated (PCM) signal, whose bit coding is
shown in
Figure 2
. For a transmitted ‘0’ there is a
512
μ
s pause followed by a 32kHz pulse train for
512
μ
s. For a transmitted ‘1’ there is 32kHz pulse
train followed by a 512
μ
s pause. This gives a bit
time of 1024
μ
s for all bits.This is shown as
Figure 2
.
Figure 2
Bit coding of PCM signal
'0'
'1'
bit-n
1024
μ
s
512
μ
s
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