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參數(shù)資料
| 型號： | UPD17228MC |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 35/84頁 |
| 文件大?。?/td> | 393K |
| 代理商： | UPD17228MC |
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μ
PD17225, 17226, 17227, 17228
35
Data Sheet U12643EJ2V0DS00
Set value
NRZHTMM
00H
01H
04H
09H
0FH
0FH
11H
11H
19H
3FH
7FH
NRZLTMM
00H
02H
04H
09H
10H
21H
21H
22H
35H
3FH
7FH
1/f
C
(
μ
s)
1.0
2.5
5.0
10.0
16.5
25.0
26.0
26.5
40.0
64.0
120.0
f
C
(kHz)
1000
400
200
100
60.6
40.0
38.5
37.7
25.0
15.6
7.8
Duty
1/2
2/5
1/2
1/2
1/2
1/3
1/3
1/3
1/3
1/2
1/2
t
H
(
μ
s)
0.5
1.0
2.5
5.0
8.0
8.0
9.0
9.0
13.0
32.0
64.0
t
L
(
μ
s)
0.5
1.5
2.5
5.0
8.0
17.0
17.0
17.5
27.0
32.0
64.0
REM
(f
C
)
t
H
t
L
1/f
C
Setting carrier frequency and duty factor
Where the system clock frequency is f
X
and carrier frequency is f
C
:
(division ratio) = f
X
/(2
×
f
C
)
is divided into m:n and is set in the modulo registers as follows:
High-level period set value = {
Low-level period set value = {
×
m/(m + n)} – 1
×
n/(m + n)} – 1
Example
Where f
C
= 38 kHz, duty factor (high-level period) = 1/3, and f
X
= 4 MHz,
= 4 MHz/(2
×
38 kHz) = 52.6
m:n = 1:2
From the above, the value of the modulo register is:
High-level period . .
Low-level period. .
Therefore, the carrier frequency is 37.74 kHz.
Table 5-1. Carrier Frequency List (f
X
= 4 MHz)
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